310 Catalogue of North American Sphinges. 
3. T. denudatum. 
Chestnut-brown ; fore-wings opaque, with a large triangular 
transparent spot adjacent to the outer hind-angle, a rust-red spot 
at base and another near the middle; hind-wings transparent, 
with the margin and fringe brown, and a rust-red costal spot ; 
orbits, edges of the collar, incisures of the abdomen, tibia, and 
tarsi dull yellow; antenna brownish above, rust-yellow at tip 
arid beneath. Expands from one inch and a quarter to more than 
one inch and a half. The transparent spots at the tips of the 
fore-wings have the appearance of being caused by the removal 
of the colored scales. 
The specimens, from which the descriptions of these three spe- 
cies are drawn up, had become somewhat oily, and it is possible 
that some of their characteristic markings may have become ob- 
literated. 
Genus XI. AScerta. F. (Syst. Glossat. ) 
Sesia. F. (Entom. Syst.) Latr. Boisd. T'rochilium. Scopoli. 
1. 4. tricincta. H. (Catalogue. ) : 
Blue-black ; fore-wings opaque ; hind-wings transparent, with 
the border, fringe, and a short transverse line near the middle 
black ; palpi at tip, collar, a spot on each shoulder, and three 
bands on the abdomen yellow; antennz short, black; four pos 
terior tibiae banded with orange ; tarsi yellow, tipped with black ; 
tail flat, with two longitudinal yellow lines. Expands from one 
inch to one inch and two lines. : 
This species seems to come near to the European Asiliforms ; 
but the male has only three yellow abdominal bands; while 2 
the Asiliformis there are five bands in the male sex. The am 
tennz are shorter and thicker than in the following species, and 
are furnished beneath with a double row of short pectinations oF 
teeth, which are thickly fringed with hairs. "The sexes wer 
captured together upon the common tansy. 
2. 42. Cucurbite. H. (New-England Farmer.) 
Fore-wings opaque, lustrous olive-brown ; hind-wings transp@ 
rent, with the margin and fringe brown; antennz greenish black ; 
palpi pale yellow, with a little black tuft near the tip; thorax 
olive ; abdomen deep orange, with a transverse basal black band, 
and a longitudinal row of five or six black spots; tibie and tarst 
of the hind-legs thickly fringed on the inside with black, and 0” 
