376 MISC. PUBLICATION 657, U. S. DEPT. OF AGRICULTURE 
The full-grown larva of the walnut sphinx (Cressonia juglandis 
(A. & S.)) is about 2 inches long. ranges in color from light green 
to reddish, coarsely granulated with white. The head is truncate in 
front and triangular, the apex bearing two rough, brownish projec- 
tions, and on each side of the head there is a yellowish stripe. The 
body has seven light yellowish oblique stripes, sometimes bordered 
above with reddish, and often very indistinct. The caudal horn is 
brownish and very granulated (fig. 71, #). The young larva is 
yellowish green. 
This species occurs from Canada to Florida and westward to the 
eastern boundary of the Great Plains. The larvae feed on butternut, 
black walnut, the hickories (including pecan), and hop hornbeam. 
There is one generation in the North and at least a partial second in the 
South. The moths emerge in June and July in the North but much 
earlier in the Southern States. In the two-generation zone the larvae 
may be found from May to September, and farther north from July 
to September. The pupae pass the winter in the ground. This 
species is sometimes rather common in pecan orchards. 
The full-grown larva of Hemaris thysbe (F.), the hummingbird 
clearwing, is about 2 inches long. The head is rounded and bluish 
green, the body yellowish green, with a green dorsal line bordered 
with whitish, sometimes a vinous tint. There is a subdorsal, longi- 
tudinal, whitish line on each side, sometimes male obsolete, the 
spiracles are reddish and white, the caudal horn bluish with black 
granulations, the thoracic legs brownish with black at base, and the 
abdominal legs blackish toward tip on the outer side. The head and 
the cervical and anal shields are coarsely granulated, and the body 
is rather finely granulated. Some specimens have a purplish tint. 
This species is found in Canada and Nova Scotia, southward to Flor- 
ida and west to the Mississippi Valley. The larvae feed on the vi- 
burnums, and sometimes they have been very common in nursery 
rows. ‘There may be two generations or at least a partial second, the 
moths emerging from May to August, and the larvae being found from 
June to October. The winter is passed in the pupal stage on the 
ground. 
Hemaris difinis (Bdv.), the snowberry clearwing, is distributed 
from New England to Georgia and westward to the eastern boundaries 
of the Great Plains. The larvae feed on snowberry and bush honey- 
suckle. There are two generations a year. 
The full-grown larva ‘of Sphecodina abbottii (Swaine), the abbott’s 
sphinx, is fully 3 inches in length and has a polished eyelike tubercle 
in place of a caudal horn. The color and markings are variable; one 
form is chocolate brown with numerous transverse, blackish lines, also 
two dark-brown, longitudinal, dorsal stripes and another on each side 
of the body; the second form is reddish brown with large, light-green 
patches on the back and along the sides of the body (fig. 71, A, B). 
The partly grown larva is bluish green with transverse, blackish lines 
and the caudal horn is aborted and of an orange color. This species 
ranges from southern Canada through the Eastern States and west to 
Iowa and Kansas. Its larvae feed on Virginia creeper and grape. 
Although rarely if ever abundant they sometimes cause concern to 
owners of vines. The moths emerge in May and June,larvae are found 
