WO, the Pink-spotted Hawk Moth:
This species has not been reported in Weber County,
but may be there
as a stray. The moth is a very strong flier and is frequently
encountered far north of its usual range.
USGS, the Five-spotted Hawkmoth:
This large bodied moth flies in tobacco fields and vegetable gardens
(potatoes, tomatoes) and wherever host plants are found.
WO, the Carolina Sphinx:
This species is not recorded in Weber County, and would be an
unlikely possibility (usually more eastern).
If you grow tomatoes, however, you have may have encountered it.
Larvae get very large and can strip a tomato plant.
WO, the Asella Sphinx:
This species is not recorded in Weber County, but might be present
(usually more southerly).
It flies in pinyon-juniper woodland and similar arid situations in
Colorado (specimen type locality) and Nevada, Utah,
Arizona and New Mexico.
WO, the Northern Ash
Sphinx or Great Ash Sphinx: The upperside of the forewing is soft dark-gray to blue-gray with
a series of black dashes, one reaching the wing tip. Note grey
thorax with narrow black lines.
the Wild Cherry Sphinx:
This species is officially reported for Weber County.
I only see them only occasionally on P.E.I. despite visiting lights frequently.
This species is not reported for Weber County but should be present.
It flies in arid brushlands and desert foothills.
This species is confirmed in Weber County by James P. Tuttle, in a disjoint population
from its more common eastern distribution/range.
Note the pm line, absent in Sphinx poecila which flies
more to the north.
The terminal area, especially near the anal angle, is much darker
in Sphinx gordius than
in Sphinx poecila.
the Canadian Sphinx or
This one is reported from Weber County.
USGS, the Snowberry Sphinx:
Snowberry Sphinx adults fly as a single brood in montane woodlands and along prairie
streamcourses from April to August.
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 at the apex.
the Modest Sphinx or Poplar Sphinx:
This large poplar/willow feeder is possibly in Weber County, but is more likely replaced there by the following species.
They are a heavy bodied species.
Pachysphinx occidentalis, North Ogden, July 18, 2014, Bill Anderson
the Big Poplar Sphinx:
This one is quite similar to Pachysphinx modesta, with modesta
being smaller and darker.
Moths should be on the wing from June-August. Lines are more distinct in occidentalis.
WO Doubtful, 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 probably present as it
ranges across North America.
The hindwings have a small blue eyespot ringed with black on a yellow background.
USGS, the Cerisyi's
Sphinx or One-eyed Sphinx,
Larvae feed on poplars and willows:
Flight would be from late May-July as a single brood.
the Snowberry Clearwing or Bumblebee 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.
the Rocky Mountain Clearwing:
There is probably a single brood of this montane species from
The moth is seen along streamsides and in meadows in
the Achemon Sphinx:
This moth is not recorded for Weber County,
but it might be present wherever grapes are found.
Fight would be from June to August. Larvae feed on grape foliage.
WO very doubtful; more southerly,
Wiest's Primrose Sphinx:
Euproserpinus wiesti adults fly, during the day, over sand washes
blow-outs as a single brood from May-June.
the White-lined Sphinx:
Adults usually fly at dusk, during the night, at dawn, and during the
day. Moths nectar at salvia and oviposit on a number of different
plants. It is confirmed for Weber County by USGS.
USGS, 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.