THE SUGAR-CANE MOTH BORER. 13 
more than 12 mm. long by 3 mm. wide. They are white at first, but 
later an orange hue develops. They are lightly sculptured with an 
irregular network of depressed lines which is visible with a micro- 
scope. This sculpturing resembles the "pebble grain" of leather. 
Just before hatching the black heads of the young larvae are plainly 
visible through the eggshell, and the eggs assume a blackish hue. 
Eggs may be deposited on either side of a leaf. The fresh ones are 
very difficult to find, their whiteness blending with the green of the 
cane or corn leaf. They are securely glued to the leaf surface and in 
nature are never detached before hatching. Having hatched, the 
empty shells become translucent white. The appearance of a cluster 
of eggshells from which the larvae have emerged has been well likened 
to a fragment of cast snake skin. 
When parasitized the eggs gradually turn jet black and remain so 
even with the emergence of the parasites. Because of their color, 
parasitized eggs are much more easily detected in the field than are 
the normal eggs. The holes made by the parasites in emerging are 
readily discernible. (PL II.) 
THE LARVA. 
The larva, which is the form of the insect most familiar to sugar 
planters, is about 1 inch long by one-eighth inch wide. In this form 
the insect commits its ravages. The head is brown and the body 
white with brown spots. This is the summer coloration of the larva, 
but in the winter it loses its spots and the body assumes a uniform 
dirty white. 
Technical descriptions of both the winter and summer forms (full- 
fed larvae) have been published elsewhere by the senior writer (75), 
and they have now been corrected by Mr. Carl Heinrich to conform to 
the latest knowledge of lepidopterous larval characters. His descrip- 
tions are given below. 
Genekal Chaeacteks. 
No secondary hairs. Legs and prolegs normal. Crochets triordinal and in a 
complete circle. No anal fork. Prothoracic shield broad, divided. A narrow 
pigmented shield on mesothorax, caudad of setae la and Id, bearing no setse. 
Spiracles elongate oval; prothoracic spiracle twice the size of those on ab- 
dominal segments 1 to 7 ; that on segment 8 slightly larger than prothoracic 
and slightly dorsad of other abdominal spiracles. (PI. Ill, figs. 1, 3, 5.) 
Body setw (PI. IV, fig. 1) moderately long; tubercles prominent, broadly 
chitinized; IV and V on abdominal segments 1 to 8 under the spiracle and 
approximate; prespiracular shield of prothorax narrow, horizontally elongate, 
bearing only two setae (IV and V) situated ventro-cephalad of the spiracle, III 
of prothorax absent; group VI bisetose on prothorax, mesothorax, and meta- 
thorax ; 1 IV and V united on abdominal segment 9 and approximate to III ; 
1 This is the Pi group of Fracker which he erroneously describes as unisetose in the 
Crambinae. See Fracker, S. B. The classification of lepidopterous larva?. Illinois 
Biological Monographs, v. 2, No. 1. 169 p., 10 pi. 1915. (See p. 87, 91.) 
