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 tibicE. 



3. G. (L.) 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. Ctenucka. Kirby. 

 Antenna; 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, nearly cylindrical and obtuse, covered 

 with small close scales, and somewhat hairy at base. Wings in some rather nar- 

 row, in others widened and rounded at the tip ; discoidal cell of the hind pair 

 closed by an angulatcd nervure. Body nearly cylindrical, enlarged a little behind 

 in the females, with a few minute tufls at the sides of the segments, obtuse and 

 slightly tufled at tip; first abdominal segment with a conspicuous tubercle on each 

 side. Spurs of the hind-legs small, four in number, two terminal, and two beyond 

 tho middle of the tibis. 



4. G. (C.) scmidiaphana. H. 



Slate-colored ; wings rather narrow and subacute ; first pair 

 brownish slate, with the anterior edge clay-colored ; hind-wings 

 semitransparent in the middle ; head and antennae black ; collar, 

 front edge of the breast, and base of the palpi, orange-colored. 

 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- 



