298 Catalozue of North American Sphinges. 
The tongue-case of the pupa, from the figure, seems to be short 
and soldered to the breast. From the shape of its body and 
wings, this insect must belong to a very distinct group in the 
- Linnean genus Sphinx; but, without knowing more of the larva 
and its transformations, I do not feel authorized to separate it 
from the present genus. 
Genus IV. Puivampe us. H. 
The insects belonging to this genus cannot with propriety be 
included in the genus Cherocampa of Duponchel, or Metopsilus 
of Duncan, to which they approach the nearest ; and, therefore, 
I have considered it proper to institute a new genus for their 
reception. 'They, indeed, seem to form a characteristic and typi- 
cal group, peculiar to the New World, being found only in the 
United States, Mexico, the West Indies, and the tropical parts of 
South America. The larve feed chiefly on the vine and the 
plants allied to it, which suggested the name of the genus, de- 
rived from gem, I love, and céuacios, a grape-vine. In those spe- 
cies whose transformations have passed under my own obser- 
vation, the larve when young were furnished with a long slen- 
der caudal horn, recurved over the back like the tail of a dog; 
when about half grown, the caudal horn is shed with the skin, 
and is replaced by a prominent, eye-like, polished spot. The 
oblique spots on the sides of these larve slope downwards and 
backwards; this is also the direction of the bands in the larve 
of Pterogon ; but in those of all the other Sphinges the oblique 
lateral bands slope upwards and backwards. 'T'he pupa is elon- 
gated, attenuated at the fore-part, with a pretty long, robust, 
rough, anal horn, notched at the tip; the tongue-case is buried 
and soldered to the breast, and slightly longer than the wing- 
cases; and the fore-part of the abdominal rings is roughened 
with deep punctures. In the perfect state, the fore-wings are el 
tire, acute, slightly emarginated below the tip in the males, and 
almost falcated, with a sinous inner margin, and well-marked 
hind-angle; the outer margin of the hind-wings is undulated oF 
slightly crenated ; the shoulder-covers are large; and the abdo- 
men is short, thick, conical, ‘and usually immaculate. Madame 
Merian in her Insectes de Surinam, plates 34 and 47, has repr 
sented the transformations of three species of this genus; and 
two are also figured by Mr. Abbot in the Insects of Georgia, plates 
- 40 and 41. 
