Updated as per James P. Tuttle's The Hawk Moths of North America, August 10, 2013
Updated as per BAMONA; August 10, 2013

Big Horn County, Wyoming
Sphingidae

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 do not have confirmed reports of all of these species in Big Horn County, but I (WO) expect they are present.

Please also send your sightings to BAMONA, an excellent on-line resource. As of August 10, 2013, one Sphingidae species (Smerinthus cerisyi; might be Smerinthus ophthalmica) is confirmed by BAMONA as flying in Big Horn County. I am sure there are many species there which simply have not been reported.
Visit BigHorn County Sphingidae Larvae.
Visit Wyoming Catocala: Underwing Moths.

Sphinginae subfamily

Sphingini Tribe:

Sphinx drupiferarum WO, the Wild Cherry Sphinx
The costal area in the basal and median areas of the forewing is light grey. This colour also appears in the terminal area. The rest of the wing is dark slatey grey.

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. The upperside of the hindwing is deep yellow in males, pale yellow in females; both with a wide black border.

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.
The forewing is grey brown with diffuse lines. The hindwing is bergundy with dark blue to black markings near the anal angle.

Pachysphinx occidentalis WO, the Big Poplar Sphinx
This one is quite similar to Pachysphinx modesta, with modesta being smaller and darker.
Forewing lines are more distinct in P. occidentalis as compared to P. modesta. There may be naturally occuring hybrids in Laramie.

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

Smerinthus cerisyi BAMONA, the Cerisyi's Sphinx
If you have willows and poplars nearby, you've probably got populations of the Cerisyi's Sphinx.
The hindwings are quite striking.

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

Macroglossinae subfamily

Dilophonotini tribe

Hemaris thetis WO, 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.

Hyles gallii WO, the Bedstraw Hawk Moth or Gallium Sphinx
This forewing is dark brown with a slightly irregular cream-coloured transverse line. The outer margin is grey. There is a bright pink band on the hindwing.

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
This day flier, April-June, prefers oak woodland and pine-oak woodland in foothills. Moths nectar at a variety of flowers in the afternoon.

Proserpinus flavofasciata WO, the Yellow-banded Day Sphinx.
The upperside of the forewing is medium to dark brown with a faint to distinct white median band. The upperside of the hindwing is dark brown with a wide orange median band which may not reach the inner margin. The moth mimics a bumblebee.

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Big Horn County, Wyoming Sphingidae

Sphinginae subfamily

Sphingini Tribe:

Sphinx drupiferarum WO, the Wild Cherry Sphinx The costal area in the basal and median areas of the forewing is light grey. This colour also appears in the terminal area. The rest of the wing is dark slatey grey.

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. The forewing is grey brown with diffuse lines. The hindwing is bergundy with dark blue to black markings near the anal angle.

Pachysphinx occidentalis WO, the Big Poplar Sphinx This one is quite similar to Pachysphinx modesta, with modesta being smaller and darker. Forewing lines are more distinct in P. occidentalis as compared to P. modesta. There may be naturally occuring hybrids in Laramie.

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

Smerinthus cerisyi BAMONA, the Cerisyi's Sphinx If you have willows and poplars nearby, you've probably got populations of the Cerisyi's Sphinx. The hindwings are quite striking.

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

Macroglossinae subfamily

Dilophonotini tribe

Hemaris thetis WO, 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.

Hyles gallii WO, the Bedstraw Hawk Moth or Gallium Sphinx This forewing is dark brown with a slightly irregular cream-coloured transverse line. The outer margin is grey. There is a bright pink band on the hindwing.

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 This day flier, April-June, prefers oak woodland and pine-oak woodland in foothills. Moths nectar at a variety of flowers in the afternoon.

Proserpinus flavofasciata WO, the Yellow-banded Day Sphinx. The upperside of the forewing is medium to dark brown with a faint to distinct white median band. The upperside of the hindwing is dark brown with a wide orange median band which may not reach the inner margin. The moth mimics a bumblebee.

Big Horn County, Wyoming
Sphingidae

Sphinx drupiferarum WO, the Wild Cherry Sphinx
The costal area in the basal and median areas of the forewing is light grey. This colour also appears in the terminal area. The rest of the wing is dark slatey grey.

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.
The forewing is grey brown with diffuse lines. The hindwing is bergundy with dark blue to black markings near the anal angle.

Pachysphinx occidentalis WO, the Big Poplar Sphinx
This one is quite similar to Pachysphinx modesta, with modesta being smaller and darker.
Forewing lines are more distinct in P. occidentalis as compared to P. modesta. There may be naturally occuring hybrids in Laramie.

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

Smerinthus cerisyi BAMONA, the Cerisyi's Sphinx
If you have willows and poplars nearby, you've probably got populations of the Cerisyi's Sphinx.
The hindwings are quite striking.

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

Hemaris thetis WO, 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.

Hyles gallii WO, the Bedstraw Hawk Moth or Gallium Sphinx
This forewing is dark brown with a slightly irregular cream-coloured transverse line. The outer margin is grey. There is a bright pink band on the hindwing.

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
This day flier, April-June, prefers oak woodland and pine-oak woodland in foothills. Moths nectar at a variety of flowers in the afternoon.

Proserpinus flavofasciata WO, the Yellow-banded Day Sphinx.
The upperside of the forewing is medium to dark brown with a faint to distinct white median band. The upperside of the hindwing is dark brown with a wide orange median band which may not reach the inner margin. The moth mimics a bumblebee.