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
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.
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.
the Canadian Sphinx or
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.
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.
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.
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.
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.
If you have willows and poplars nearby, you've probably got populations of
the Cerisyi's Sphinx.
The hindwings are quite striking.
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.
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.
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.
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.
This day flier, April-June, prefers oak woodland and pine-oak
woodland in foothills. Moths nectar at a
variety of flowers in the afternoon.
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.
Use your browser "Back" button to return to the previous page.
This page is brought to you by Bill Oehlke and the
WLSS. Pages are on space rented from Bizland. If you would like to become a "Patron of the Sphingidae Site", contact Bill.
Please send sightings/images to Bill. I will do my best to respond to requests for identification help.
Enjoy some of nature's wonderments: Saturniidae cocoons. Cocoons of these
giant silkmoths are for sale in fall and winter. Large, beautiful moths emerge in the spring and summer.
Show appreciation for this site by clicking on flashing butterfly to the left.
The link will take you to a page with links to many insect sites.