Updated as per James P. Tuttle's The Hawk Moths of North America, October 2009
Updated as per personal communication with Wallace B. Thompson, October 2009

Northern Texas
Sphingidae

Hyles lineata, Borger, Hutchinson County, Texas, courtesy of Wallace B. Thompson.
This page is inspired by and dedicated to Wallace B. Thompson who sent me the picture of Hyles lineata from Borger (Hutchinson County) at the top of this page. Wallace also forwarded images of larvae of Hyles lineata, Hemaris diffinis and what I believe is a heavily parasitized Paratrea plebeja. Those pictures are posted on the larva thumbnail page for northern Texas.
In September, 2011, Wallace sent me images of an Hemaris diffinis adult, as well as images of adult and larva of Eumorpha achemon.
Seventy-five Sphingidae species are listed for Texas on the U.S.G.S. website. Not all of the species are reported or anticipated in the northern region. It is hoped that this checklist, with the thumbnails and notes, will help you quickly identify the moths you are likely to encounter.
A "USGS" indicates the moth is reported on the USGS website and/or in Lepidoptera of North America, #1. Distribution of Silkmoths (Saturniidae) and Hawkmoths (Sphingidae) of Eastern North America, 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 electronic image, via email to Bill Oehlke.
The night-blooming moon flower will attract many Sphingidae at dusk and into the night.

Sphinginae subfamily

Sphingini tribe:

Agrius cingulata, WO Pink-spotted hawkmoth. This species is a strong migrant and adults nectar from deep-throated flowers including moonflower (Calonyction aculeatum), morning glory (Convolvulus), honey suckle (Lonicera) and petunia (Petunia species). doubtful, usually just southern half of Texas

Ceratomia amyntor WO, the Elm Sphinx or Four-horned Sphinx. The upperside of the forewing is brown with dark brown and white markings including a white costal area near the wing base, dark streaks along the veins, and a white spot in the cell. Larvae feed on Elm (Ulmus), birch (Betula), basswood (Tilia), and cherry (Prunus). doubtful, usually northeastern Texas

Ceratomia catalpae WO, the Catalpa Sphinx. The upperside of the forewing is yellowish brown with no white markings, but there are indistinct black lines and dashes. The cell spot is gray with a black outline. The larvae feed in large groups and are much more spectacular than the moths.
Catalpa is the larval host. generally more eastern species

Ceratomia hageni WO, Hagen's Sphinx or Osage Orange Sphinx. The upperside of the forewing is gray with a green tint and has dark indistinct wavy lines, and pale gray patches at the wing tip and along the costa. generally more eastern species

Ceratomia undulosa WO, the Waved Sphinx. The upperside of the forewing is pale brownish gray with wavy black and white lines and a black-outlined white cell spot. The upperside of the hindwing is gray with diffuse darker bands. doubtful, usually more easterly

Manduca quinquemaculatus WO, the Five-spotted Hawkmoth
I suspect if you grow tomatoes, you are likely to encounter Manduca quinquemaculatus.

Manduca rustica WO, the Rustic Sphinx. Look for three large yellow spots on each side of the abdomen. The upperside of the forewing is yellowish brown to deep chocolate brown with a dusting of white scales and zigzagged black and white lines. generally more eastern and southerly.

Manduca sexta WO, the Carolina Sphinx
If you grow tomatoes, you have probably encountered Manduca sexta in the larval stage.
Larvae get very large and can strip a tomato plant.

Paratrea plebeja WBT, the Plebeian Sphinx
The upperside of the forewing is gray with indistinct black and white markings. There is a series of black dashes from the base to the tip, and a small white cell spot.
Paratrea plebeja larva, Borger, Hutchinson County, Wallace B. Thompson

Sphinx chersis 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 of which reaches the wing tip. Larval hosts are ash, lilac, privet, cherry, and quaking aspen.

Sphinx libocedrus WO, the Incense Cedar Sphinx
The upperside of the forewing is pale blue-gray to dark gray with a black dash reaching the wing tip and a white stripe along the lower outer margin.
The upperside of the hindwing is black with two diffuse white bands, the upper one being practically non-existent.

Smerinthini Tribe:

Amorpha juglandis WO, the Walnut Sphinx
The adults are also highly variable; sometimes wings of an individual may be all one color or may have several colors, ranging from pale to dark brown, and may have a white or pink tinge. Patterns range from faint to pronounced. See the file for the female; she is different.

Pachysphinx modesta WO, the Modest Sphinx or Poplar Sphinx
They are common on Prince Edward Island, and larvae feed on poplars and willows.

Macroglossinae subfamily

Dilophonotini tribe:

Aellopos clavipes WO, the Aellopos Sphinx.
The body is dark brown with a wide white band across the abdomen. Wings are dark brown. The forewing has a black cell spot and 3 white spots near the pale brown marginal area. unlikely stray

Aellopos fadus WO, the Fadus Sphinx.
The body is brown with a wide white band across the abdomen. The upperside of wings is dark brown; the forewing has two bands of pale spots and lacks a black spot (typical of clavipes) at the end of the cell. unlikely stray

Aellopos titan WO, the Titan Sphinx.
The body is dark brown with a wide white stripe across the abdomen. The wings are dark brown. It is very similar to above species, but the upperside of the hindwing has pale patches along the costa and inner margin. unlikely stray

Hemaris diffinis WBT, the Snowberry Clearwing or Bumblebee Moth
Adults mimic bumblebees and are quite variable. 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 before the tip.
Hemaris diffinis larva and adult, Borger, Hutchinson County, Wallace B. Thompson

Philampelini tribe:

Eumorpha achemon WO/WBT, the Achemon Sphinx
Larvae get large and feed on grape vines and Virginia creeper.
Note the differences between this moth and the Pandorus Sphinx.
Eumorpha achemon larva and adult, Borger, Hutchinson County, Wallace B. Thompson

Macroglossini tribe:

Darapsa myron WO, the Virginia Creeper Sphinx or the Grapevine Sphinx

If you have the foodplants indicated in the common names, you probably have this species nearby. The lower wings are orange.

Euproserpinus wiesti WO, Wiest's Primrose Sphinx
Euproserpinus wiesti adults fly, during the day, over sand washes and prairie blow-outs as a single brood from May-June.

Hyles lineata WBT, the White-lined Sphinx
This species has strong migrating tendancies from much further south. There are records from New Hampshire and Maine.
Hyles lineata, Bergor, Hutchinson County, Wallace B. Thompson.

Proserpinus juanita WO, the Juanita Sphinx
The upperside of the forewing is pale gray-green with a deep green-brown median area and a white dash at the wing tip. rare

Enjoy some of nature's wonderments, giant silk moth cocoons. These cocoons are for sale winter and fall. Beautiful Saturniidae moths will emerge the following spring and summer. Read Actias luna rearing article. Additional online help available.
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Northern Texas Sphingidae

Sphinginae subfamily

Sphingini tribe:

Agrius cingulata, WO Pink-spotted hawkmoth. This species is a strong migrant and adults nectar from deep-throated flowers including moonflower (Calonyction aculeatum), morning glory (Convolvulus), honey suckle (Lonicera) and petunia (Petunia species). doubtful, usually just southern half of Texas

Ceratomia hageni WO, Hagen's Sphinx or Osage Orange Sphinx. The upperside of the forewing is gray with a green tint and has dark indistinct wavy lines, and pale gray patches at the wing tip and along the costa. generally more eastern species

Ceratomia undulosa WO, the Waved Sphinx. The upperside of the forewing is pale brownish gray with wavy black and white lines and a black-outlined white cell spot. The upperside of the hindwing is gray with diffuse darker bands. doubtful, usually more easterly

Manduca quinquemaculatus WO, the Five-spotted Hawkmoth I suspect if you grow tomatoes, you are likely to encounter Manduca quinquemaculatus.

Manduca rustica WO, the Rustic Sphinx. Look for three large yellow spots on each side of the abdomen. The upperside of the forewing is yellowish brown to deep chocolate brown with a dusting of white scales and zigzagged black and white lines. generally more eastern and southerly.

Manduca sexta WO, the Carolina Sphinx If you grow tomatoes, you have probably encountered Manduca sexta in the larval stage. Larvae get very large and can strip a tomato plant.

Paratrea plebeja WBT, the Plebeian Sphinx The upperside of the forewing is gray with indistinct black and white markings. There is a series of black dashes from the base to the tip, and a small white cell spot.

Sphinx chersis WO, the Northern Ash Sphinx or Great Ash SphinxThe upperside of the forewing is soft dark gray to blue-gray with a series of black dashes, one of which reaches the wing tip. Larval hosts are ash, lilac, privet, cherry, and quaking aspen.

Smerinthini Tribe:

Pachysphinx modesta WO, the Modest Sphinx or Poplar Sphinx They are common on Prince Edward Island, and larvae feed on poplars and willows.

Macroglossinae subfamily

Dilophonotini tribe:

Aellopos clavipes WO, the Aellopos Sphinx. The body is dark brown with a wide white band across the abdomen. Wings are dark brown. The forewing has a black cell spot and 3 white spots near the pale brown marginal area. unlikely stray

Aellopos fadus WO, the Fadus Sphinx. The body is brown with a wide white band across the abdomen. The upperside of wings is dark brown; the forewing has two bands of pale spots and lacks a black spot (typical of clavipes) at the end of the cell. unlikely stray

Aellopos titan WO, the Titan Sphinx. The body is dark brown with a wide white stripe across the abdomen. The wings are dark brown. It is very similar to above species, but the upperside of the hindwing has pale patches along the costa and inner margin. unlikely stray

Philampelini tribe:

Eumorpha achemon WO/WBT, the Achemon Sphinx Larvae get large and feed on grape vines and Virginia creeper. Note the differences between this moth and the Pandorus Sphinx.

Macroglossini tribe:

Darapsa myron WO, the Virginia Creeper Sphinx or the Grapevine Sphinx If you have the foodplants indicated in the common names, you probably have this species nearby. The lower wings are orange.

Euproserpinus wiesti WO, Wiest's Primrose Sphinx Euproserpinus wiesti adults fly, during the day, over sand washes and prairie blow-outs as a single brood from May-June.

Hyles lineata WBT, the White-lined Sphinx This species has strong migrating tendancies from much further south. There are records from New Hampshire and Maine.

Proserpinus juanita WO, the Juanita Sphinx The upperside of the forewing is pale gray-green with a deep green-brown median area and a white dash at the wing tip. rare

Northern Texas
Sphingidae

Manduca quinquemaculatus WO, the Five-spotted Hawkmoth
I suspect if you grow tomatoes, you are likely to encounter Manduca quinquemaculatus.

Manduca sexta WO, the Carolina Sphinx
If you grow tomatoes, you have probably encountered Manduca sexta in the larval stage.
Larvae get very large and can strip a tomato plant.

Paratrea plebeja WBT, the Plebeian Sphinx
The upperside of the forewing is gray with indistinct black and white markings. There is a series of black dashes from the base to the tip, and a small white cell spot.

Sphinx chersis 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 of which reaches the wing tip. Larval hosts are ash, lilac, privet, cherry, and quaking aspen.

Pachysphinx modesta WO, the Modest Sphinx or Poplar Sphinx
They are common on Prince Edward Island, and larvae feed on poplars and willows.

Aellopos clavipes WO, the Aellopos Sphinx.
The body is dark brown with a wide white band across the abdomen. Wings are dark brown. The forewing has a black cell spot and 3 white spots near the pale brown marginal area. unlikely stray

Aellopos fadus WO, the Fadus Sphinx.
The body is brown with a wide white band across the abdomen. The upperside of wings is dark brown; the forewing has two bands of pale spots and lacks a black spot (typical of clavipes) at the end of the cell. unlikely stray

Aellopos titan WO, the Titan Sphinx.
The body is dark brown with a wide white stripe across the abdomen. The wings are dark brown. It is very similar to above species, but the upperside of the hindwing has pale patches along the costa and inner margin. unlikely stray

Eumorpha achemon WO/WBT, the Achemon Sphinx
Larvae get large and feed on grape vines and Virginia creeper.
Note the differences between this moth and the Pandorus Sphinx.

Darapsa myron WO, the Virginia Creeper Sphinx or the Grapevine Sphinx

If you have the foodplants indicated in the common names, you probably have this species nearby. The lower wings are orange.

Euproserpinus wiesti WO, Wiest's Primrose Sphinx
Euproserpinus wiesti adults fly, during the day, over sand washes and prairie blow-outs as a single brood from May-June.

Hyles lineata WBT, the White-lined Sphinx
This species has strong migrating tendancies from much further south. There are records from New Hampshire and Maine.

Proserpinus juanita WO, the Juanita Sphinx
The upperside of the forewing is pale gray-green with a deep green-brown median area and a white dash at the wing tip. rare