12 
pose the egg state to have continued a still longer time. We shall 
therefore assume fourteen days as the average term of existence in 
the egg state. But this is not done arbitrarily, as will hereafter be seen. 
THE LARVA. 
As there are some differences in 
the markings of the larvae, depend¬ 
ing in part upon the stages of 
growth, the abundance or scarcity 
of food, and whether they are march¬ 
ing or sedentery, I will give here 
the descriptions made by different par- 
Fig. 3— L. unipuncta—Larva. ties at different localities. The short 
description by Mr. Kirkpatrick has already been given in the quo¬ 
tation from his paper in the Ohio Agricultural Report of 1855. 
“The larva or worm when full grown is about one inch and a 
quarter long, diameter usually something less than one-fourth of an 
of an inch. Has six true legs (legs with claws), two placed on each 
the first, second and third segments, back of the head. Also eight 
ventral pro-legs, two on each the sixth, seventh, eighth and ninth 
segments, and two legs at the latter end of the body. It is striped 
lengthwise with dirty-white and greenish-brown or dusky stripes 
arranged as follows: Along the back is a broad dark or dusky 
stripe darker in the middle, fading toward the borders and bordered 
with black. Next below this on each side comes a narrow dark 
stripe; and next comes another white stripe which frequently has a 
reddish cast; this last stripe is immediately above the legs and 
along the line of the stigmatae or breathing pores. All beneath pale 
green. The legs are often marked with spots or rings of black. 
The head is large, equal in diameter to the segment next to it. 
It is marked with two dark lines that arise from the sides of the 
mouth and extend over to the back part of the head; they approach 
each other in the middle and again recede behind. The prominent 
cheeks or sides bounded by these lines are of a pale fulvous, 
chequered over with narrow lines of dark brown. There are a few 
scattering hairs over the body and on the front part of the head.” 
—(Thomas). 
“The head is yellowish brown, of a diameter as great as that of 
the first segment, speckled with confluent fuscous dots. It is 
marked longitudinally by two dark lines that commence 'at the cor¬ 
ners of the mouth, approach each other towards the center and 
again recede behind. Over the mouth, between and on each side of 
these lines, is a short dark longitudinal line, and outside these again 
a dark dot. The mouth is dusky. The body is marked for its 
entire length as follows: On the back a broad dusky stripe darker 
in the middle and fading towards the borders: then a narrow black 
line; then a narrow subobsolete white line. Beneath all is of a pale 
obscure green. By holding the insect to the light, a very few scat¬ 
tering hairs become visible above. Legs six, slightly marked at their 
tip and base with fuscous. Pro-legs ten, normal, marked on their 
exterior, middle and on their tip with black, the anal ones less obvi¬ 
ously so. The length does not exceed one and a quarter inches.” 
—(Walsh). 
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