318 Catalogue of North American Sphinges. 
closed by an oblique nervure. Body rather short, nearly cylindrical, not tufted 
behind. Spurs of the hind-legs three, two at the end and one beyond the middle 
of the tibiz. 
3. G. (Z.) Pholus. Drury. 
Blue-black, or deep indigo-blue, wings at base and shoulder- 
covers orange-colored. Expands fourteen or fifteen lines. Larva, 
according to Mr. Leonard, pale green, with yellowish spots run- 
ning into the green (in a specimen preserved in spirit, pale green 
-mottled with red;) head black, covered with a few short whitish 
hairs ; body sparingly clothed with rather long hairs, which are 
white at the sides and black on the back, the hairs arising singly 
from minute tubercles, those on the third segment the longest 
and with the others before them directed forwards. It eats the 
lichens on stone heaps and walls in shady places, and undergoes 
its transformations in a thin silky cocoon. 
This pretty species is often seen flying in considerable numbers 
in the fields, throughout the day, and at first sight would be mis- 
taken for a species of Lycus. 
Subgenus. Ctenucha. Kirby. 
Antennz pectinated on both sides in the males, thickened in the middle with 
extremely short pectinations in the females. Tongue moderate, spirally rolled. 
Palpi slender, rising beyond the clypeus, néarly cylindrical and obtuse, covered 
with small close scales, and somewhat hairy at base. Wings in some rather nat- 
row, in others widened and rounded at the tip; discoidal cell of the hind pair 
closed by an angulated nervure. Body nearly cylindrical, enlarged a little behind 
in the females, with a few minute tufts at the sides of the segments, obtuse and 
slightly tufied at tip; first abdominal segment with a conspicuous tubercle on each 
Spurs of the hind-legs small, four in number, two terminal, and two beyond 
the middle of the tibia. . 
A. G.(C.) semidiaphana. H. 
Slate-colored ; wings rather narrow and subacute; first pait 
brownish slate, with the anterior edge clay-colored ; hind-wings 
semitransparent in the middle ; head and antenne black ; collar, 
front. edge of the breast, and base of the palpi, orange-colore 
Expands fifteen to sixteen lines. Inhabits the Middle and South- 
ern States. 
Dr. Charles Pickering, several years ago, gave me specimens of 
this insect, which he captured near Philadelphia; there are also 
specimens of it, in the cabinet of the Boston Society of Natural 
History, taken in North Carolina by Prof. Hentz; and I have re- 
cently received several individuals, in fine preservation, which 
were found by Mr. Doubleday in Florida. This species some 
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