258 Annals Entomological Society of America [Vol. V, 
Aorta.—The cephalic extension of the heart, the aorta (ao), 
starting within the metathoracic region and passing into the 
head, is a much smaller and smoother muscular tube. It runs 
close to the dorsal surface of the cesophagus and the pharynx 
and finally terminates with a slight dilation after it has passed 
beneath the supra-cesophageal ganglion (Fig. 8 and 18). This 
location of the outlet allows a constant and abundant supply of 
fresh blood within the head region. The mouth-like opening 
of the aorta is held in its characteristic position by means of 
tendons that connect themselves to the head capsule (Fig. 8). 
The heart, like the other organs of the body, is well supplied 
with air tubes. The arrangement of the heart-tracheze is shown 
in the fifth abdominal segment (Fig. 12). 
REPRODUCTIVE ORGANS. 
After examining numerous specimens for gonads, two white, 
opaque, ovate bodies (Fig. 12, 7) were found on each side adja- 
cent to the heart in the fifth abdominal segment. Difficulty 
was experienced in locating these organs on account of their 
close similarity to adipose tissue and their being embedded in 
the same. It was impossible to determine the sex of the glands 
on account of the limited material at hand. From the fifth 
abdominal spiracle, trachez arise that supply the reproductive 
organs. 
WING BUDS. 
The wing buds (f. 0. and h. 6.) are the histoblasts, imaginal 
discs, or imaginal buds of the future wings of the adult insect. 
They are formed as invaginations of the hypodermis, to which 
they are attached. They are small, kidney-shaped bodies 
located in the dorso-lateral portions of the mesothorax and 
metathorax. If a larva is cut along the ventral meson, the 
wing buds will be seen about midway between the meson and 
the outer cut body wall. Two trachez enter the wing buds at 
their base, one into the caudal portion and the other into the 
cephalic portion. 
NERVOUS SYSTEM. 
The nervous system (Fig. 13) of Protoparce carolina consists 
of a long, white cord, knotted at segmental intervals, which 
extends for the most part along the meso-ventral portion of the 
body. This ventrally located, simple nervous system is made 
up of three parts: ganglia, commissures, and nerves. .The 
