Updated as per James P. Tuttle's The Hawk Moths of North America, July 26, 2014
Updated as per BAMONA, July 26, 2014

Beaverhead County, Western Montana
Sphingidae Moths

Fifteen Sphingidae species are listed for Montana on the USGS (now BAMONA) checklist as of July 26, 2014. I have added some species to Montana which I feel are likely present. Not all of the species are reported or anticipated in Beaverhead County (One species, Hemaris thetis is reported on BAMONA as of July 26, 2014).
It is hoped that this checklist, with the thumbnails and notes, will help you quickly identify the moths you have encountered.
A "WO" after the species name indicates that I have no confirmed reports of this species in Beaverhead County, but I (William Oehlke) expect that this moth is present or might be present. A BAMONA indicates the moth is reported on the BAMONA website and/or in Moths of Western North America, #2. Distribution of Sphingidae of Western North America, revised, an excellent little booklet available through Paul Opler.
Please help me develop this list with improved, documented accuracy by sending sightings (species, date, location), preferably with an image, via email to Bill Oehlke.
I have utilized James P. Tuttle's distribution maps, as posted in his excellent book, The Hawk Moths of North America, 2007, to assist with development of this checklist. I have included several species which I have listed as remote possibility because they are slightly outside the range indicated by Tuttle's book.
Please also send your sightings to BAMONA, an excellent online resource.
Visit Beaverhead County Sphingidae Larvae: Caterpillars; Hornworms
Visit Montana Catocala: Underwing Moths

Sphinginae subfamily

Sphingini tribe:

Manduca quinquemaculatus WO, Five-spotted Hawkmoth: Abdomen usually has five but sometimes six pairs of yellow bands. Fw upperside: blurry brown; gray. "Tomato Hornworms" feed on tomato; remote possibility

Sphinx chersis WO, Northern Ash Sphinx or Great Ash Sphinx: Fw upperside:soft dark gray to blue-gray with series of black dashes, one of which reaches wing tip. Larval hosts are ash, lilac, privet, cherry, quaking aspen. remote possibility

Sphinx drupiferarum * WO, the Wild Cherry Sphinx
Sphinx drupiferarum larvae hide in the day and feed primarily on cherry, plum, and apple at night.

Sphinx luscitiosa WO, the Canadian Sphinx or Clemen's Sphinx
The upperside of the forewing is yellowish gray in males and pale gray with a faint yellow tint in females. In both sexes, the dark border on the outer margin widens as it approaches the inner margin. remote possibility

Sphinx perelegans WO, the Elegant Sphinx: Sphinx perelegans adults fly in montane woodlands and mixed chaparral-type vegetation as a single brood in the north, with adults mainly on the wing in June and July. It flies from dusk until after midnight. remote possibility

Sphinx vashti * WO, the Snowberry Sphinx
The upperside of the forewing has a narrow black subterminal line bordered by a white inverted V-shaped line on the outside, and a black line running inwards from the apex of the wing.
It is most often found in montane woodlands and along streamcourses.

Smerinthini Tribe:

Pachysphinx modesta * WO, the Modest Sphinx or Poplar Sphinx,
This moth has a large, heavy body, and females can be remarkably plump.

Pachysphinx occidentalis * WO, Big Poplar Sphinx: Quite similar to Pachysphinx modesta, with modesta being smaller and darker. Two color forms: the upperside of the forewings is yellow brown in the pale form and dark gray in the dark form. Lines and bands are well-defined.

Paonias excaecata * WO, the Blinded Sphinx
The grey-blue eyespot of the hindwing gives this species its name. Larvae feed on birches, willows, cherries and oaks.
The outer edge of the forewings is quite scalloped.

Paonias myops * WO, the Small-eyed Sphinx
This small species is probably widespread and common. This species ranges across North America.
The hindwings have a small blue eyespot ringed with black on a yellow background.

Smerinthus cerisyi * WO??, the Cerisyi's Sphinx: possibly replaced by ophthalmica in western Montana. If you have willows and poplars nearby, you've probably got populations of the Cerisyi's Sphinx. The hindwings are quite striking.

Smerinthus jamaicensis not supposed to be present WO, the Twin-spotted Sphinx: Smerinthus jamaicensis closely resembles Smerinthus cerisyi, but jamaicensis is much smaller with larger blue patches on more vibrant and deeper purple in the lower wings. remote possibility

Smerinthus opthalmica WO:
Larvae feed on poplars, aspen and willows. Note different shape of double arced forewing pm line compared to the straighter pm line of cerisyi, two moths above. S. ophthalmica has smoother scalloping of the fw outer margin.

Macroglossinae subfamily

Dilophonotini tribe

Hemaris diffinis * WO, the Snowberry Clearwing or Bumblebee Moth
The wings are basically clear, with dark brown to brownish-orange veins, bases and edges. The thorax is golden-brown to dark greenish-brown. The abdomen tends to be dark (black) with 1-2 yellow segments just before the end.

Hemaris senta WO?? * Rocky Mountain clearwing
This moth is a day flier in mountain meadows. It is easily confused with Hemaris diffinis and may actually be a form/variation of that species.

West of the Continental Divide, Hemaris diffinis is usually replaced by Hemaris thetis, and I believe H. senta is generally regarded as a junior synonym of H. thetis. Hemaris thetis is probably the only clearwing encountered in Ravalli County.

Hemaris thetis BAMONA, the Thetis Clearwing or Bee Hawk Moth,
The moth flies along forest edges and in meadows, gardens and brushy fields. Day-flying adults nectar at lantana, dwarf bush honeysuckle, snowberry, orange hawkweed, thistles, lilac, Canada violet, etc.

Macroglossini tribe

Hyles euphorbiae WO the Spurge Hawk Moth
The body is light brown with various white and dark brown markings, while the wings have a conspicuous tan, brown, and pink or red color pattern.
probably will expand there if not already present

Hyles gallii * WO, the Bedstraw Hawk Moth or Gallium Sphinx
This species is not officially reported from Cascade County; however, if you have Gallium or Epilobium, you probably have populations of this species.

Hyles lineata * WO, the White-lined Sphinx
This species is very widespread. It can be seen flying during the day, into the evening and also at night.
The highly variable larvae are often found in people's gardens.

Proserpinus clarkiae WO, Clark's Sphinx: Adults fly in the afternoon from April-June in oak woodland and pine-oak woodland in foothills, nectaring from chia, heartleaf milkweed, golden currant, bluedicks, fairyfans, vetches, thistles, hedgenettles, etc. remote possibility

Proserpinus flavofasciata WO , the Yellow-banded Day Sphinx: Proserpinus flavofasciata adults fly from April-June in meadows in coniferous forests. Adults fly during the afternoon, nectaring from lilac, dandelion, cherry, etc.

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Beaverhead County, Western Montana Sphingidae Moths

Sphinginae subfamily

Sphingini tribe:

Manduca quinquemaculatus WO, Five-spotted Hawkmoth: Abdomen usually has five but sometimes six pairs of yellow bands. Fw upperside: blurry brown; gray. "Tomato Hornworms" feed on tomato; remote possibility

Sphinx chersis WO, Northern Ash Sphinx or Great Ash Sphinx: Fw upperside:soft dark gray to blue-gray with series of black dashes, one of which reaches wing tip. Larval hosts are ash, lilac, privet, cherry, quaking aspen. remote possibility

Sphinx drupiferarum * WO, the Wild Cherry Sphinx Sphinx drupiferarum larvae hide in the day and feed primarily on cherry, plum, and apple at night.

Sphinx luscitiosa WO, the Canadian Sphinx or Clemen's Sphinx The upperside of the forewing is yellowish gray in males and pale gray with a faint yellow tint in females. In both sexes, the dark border on the outer margin widens as it approaches the inner margin. remote possibility

Sphinx perelegans WO, the Elegant Sphinx: Sphinx perelegans adults fly in montane woodlands and mixed chaparral-type vegetation as a single brood in the north, with adults mainly on the wing in June and July. It flies from dusk until after midnight. remote possibility

Sphinx vashti * WO, the Snowberry Sphinx The upperside of the forewing has a narrow black subterminal line bordered by a white inverted V-shaped line on the outside, and a black line running inwards from the apex of the wing. It is most often found in montane woodlands and along streamcourses.

Smerinthini Tribe:

Pachysphinx modesta * WO, the Modest Sphinx or Poplar Sphinx, This moth has a large, heavy body, and females can be remarkably plump.

Pachysphinx occidentalis * WO, Big Poplar Sphinx: Quite similar to Pachysphinx modesta, with modesta being smaller and darker. Two color forms: the upperside of the forewings is yellow brown in the pale form and dark gray in the dark form. Lines and bands are well-defined.

Paonias excaecata * WO, the Blinded Sphinx The grey-blue eyespot of the hindwing gives this species its name. Larvae feed on birches, willows, cherries and oaks. The outer edge of the forewings is quite scalloped.

Paonias myops * WO, the Small-eyed Sphinx This small species is probably widespread and common. This species ranges across North America. The hindwings have a small blue eyespot ringed with black on a yellow background.

Smerinthus cerisyi * WO??, the Cerisyi's Sphinx: possibly replaced by ophthalmica in western Montana. If you have willows and poplars nearby, you've probably got populations of the Cerisyi's Sphinx. The hindwings are quite striking.

Smerinthus jamaicensis not supposed to be present WO, the Twin-spotted Sphinx: Smerinthus jamaicensis closely resembles Smerinthus cerisyi, but jamaicensis is much smaller with larger blue patches on more vibrant and deeper purple in the lower wings. remote possibility

Smerinthus opthalmica WO: Larvae feed on poplars, aspen and willows. Note different shape of double arced forewing pm line compared to the straighter pm line of cerisyi, two moths above. S. ophthalmica has smoother scalloping of the fw outer margin.

Macroglossinae subfamily

Dilophonotini tribe

Hemaris diffinis * WO, the Snowberry Clearwing or Bumblebee Moth The wings are basically clear, with dark brown to brownish-orange veins, bases and edges. The thorax is golden-brown to dark greenish-brown. The abdomen tends to be dark (black) with 1-2 yellow segments just before the end.

Hemaris senta WO?? * Rocky Mountain clearwing This moth is a day flier in mountain meadows. It is easily confused with Hemaris diffinis and may actually be a form/variation of that species.

Hemaris thetis BAMONA, the Thetis Clearwing or Bee Hawk Moth, The moth flies along forest edges and in meadows, gardens and brushy fields. Day-flying adults nectar at lantana, dwarf bush honeysuckle, snowberry, orange hawkweed, thistles, lilac, Canada violet, etc.

Macroglossini tribe

Hyles euphorbiae WO the Spurge Hawk Moth The body is light brown with various white and dark brown markings, while the wings have a conspicuous tan, brown, and pink or red color pattern. probably will expand there if not already present

Hyles gallii * WO, the Bedstraw Hawk Moth or Gallium Sphinx This species is not officially reported from Cascade County; however, if you have Gallium or Epilobium, you probably have populations of this species.

Hyles lineata * WO, the White-lined Sphinx This species is very widespread. It can be seen flying during the day, into the evening and also at night. The highly variable larvae are often found in people's gardens.

Proserpinus clarkiae WO, Clark's Sphinx: Adults fly in the afternoon from April-June in oak woodland and pine-oak woodland in foothills, nectaring from chia, heartleaf milkweed, golden currant, bluedicks, fairyfans, vetches, thistles, hedgenettles, etc. remote possibility

Proserpinus flavofasciata WO , the Yellow-banded Day Sphinx: Proserpinus flavofasciata adults fly from April-June in meadows in coniferous forests. Adults fly during the afternoon, nectaring from lilac, dandelion, cherry, etc.

Beaverhead County, Western Montana
Sphingidae Moths

Sphinx drupiferarum * WO, the Wild Cherry Sphinx
Sphinx drupiferarum larvae hide in the day and feed primarily on cherry, plum, and apple at night.

Sphinx luscitiosa WO, the Canadian Sphinx or Clemen's Sphinx
The upperside of the forewing is yellowish gray in males and pale gray with a faint yellow tint in females. In both sexes, the dark border on the outer margin widens as it approaches the inner margin. remote possibility

Sphinx vashti * WO, the Snowberry Sphinx
The upperside of the forewing has a narrow black subterminal line bordered by a white inverted V-shaped line on the outside, and a black line running inwards from the apex of the wing.
It is most often found in montane woodlands and along streamcourses.

Pachysphinx modesta * WO, the Modest Sphinx or Poplar Sphinx,
This moth has a large, heavy body, and females can be remarkably plump.

Paonias excaecata * WO, the Blinded Sphinx
The grey-blue eyespot of the hindwing gives this species its name. Larvae feed on birches, willows, cherries and oaks.
The outer edge of the forewings is quite scalloped.

Paonias myops * WO, the Small-eyed Sphinx
This small species is probably widespread and common. This species ranges across North America.
The hindwings have a small blue eyespot ringed with black on a yellow background.

Smerinthus opthalmica WO:
Larvae feed on poplars, aspen and willows. Note different shape of double arced forewing pm line compared to the straighter pm line of cerisyi, two moths above. S. ophthalmica has smoother scalloping of the fw outer margin.

Hemaris diffinis * WO, the Snowberry Clearwing or Bumblebee Moth
The wings are basically clear, with dark brown to brownish-orange veins, bases and edges. The thorax is golden-brown to dark greenish-brown. The abdomen tends to be dark (black) with 1-2 yellow segments just before the end.

Hemaris senta WO?? * Rocky Mountain clearwing
This moth is a day flier in mountain meadows. It is easily confused with Hemaris diffinis and may actually be a form/variation of that species.

Hemaris thetis BAMONA, the Thetis Clearwing or Bee Hawk Moth,
The moth flies along forest edges and in meadows, gardens and brushy fields. Day-flying adults nectar at lantana, dwarf bush honeysuckle, snowberry, orange hawkweed, thistles, lilac, Canada violet, etc.

Hyles euphorbiae WO the Spurge Hawk Moth
The body is light brown with various white and dark brown markings, while the wings have a conspicuous tan, brown, and pink or red color pattern.
probably will expand there if not already present

Hyles gallii * WO, the Bedstraw Hawk Moth or Gallium Sphinx
This species is not officially reported from Cascade County; however, if you have Gallium or Epilobium, you probably have populations of this species.

Hyles lineata * WO, the White-lined Sphinx
This species is very widespread. It can be seen flying during the day, into the evening and also at night.
The highly variable larvae are often found in people's gardens.