6 
BULLETIN" 419, U. S. DEPARTMENT OF AGRICULTURE. 
DESCRIPTION OF THE GRAPE LEAF-FOLDER. 
ADULT. 
The wings of the moth when fully expanded (PL I, c) meas- 
ure about nine-tenths of an inch. These are very dark brown in 
color with an opalescent or silvery reflection, and are bordered with 
white. The forewings in both sexes have two nearly oval white 
spots, while on the hind wings of the male there is one spot, which, 
in the female, may be divided. The body is black, crossed by two 
white bands in the female and by one band in the male. The male 
antennae are thickened 
or knotted near the 
middle, while in the fe- 
male (PL I, I) they are 
uniform and thread- 
like. 
THE EGG. 
The egg of the grape 
leaf-folder (fig. 2, a; PL 
I, a) is elliptical in out- 
line and very minute, 
measuring about 0.7 
mm. in length. Its 
membranous chorion, 
or outer covering, pre- 
sents under high mag- 
nification delicate hex- 
agonal markings. 
THE LARVA. 
The larva, when 
fully grown (PL I, ~h; 
PL II, V) is about an 
inch long, is widest in 
the middle, and tapers toward either end. It is glossy, translucent 
yellow-green on the sides and somewhat darker above, with scattered 
fine yellow hairs on each segment. The head and prothoracic shield 
(PL I, /, 7i) are fight brown, and there are light-brown spots on the 
sides of the first two thoracic segments. 
THE PUPA. 
The average pupa of Desmia fuiieralis is a little over half an inch 
long (PL I, d). The light-brown color shown just after pupation 
soon turns quite dark. The pupa tapers characteristically toward 
the posterior end, where an 8-hooked cremaster is located. 
Fig. 2. — a, Egg of the grape leaf-folder showing larva just before 
hatching; b, newly hatched larva. Greatly enlarged. (Original.) 
