91 



Mention has already been madg of the places where these eggs 

 are deposited when the larva feeds upon cotton and upon corn, and 

 also that the eggs are fastened singly upon that on which the young 

 larva is first to feed. Mr. Glover is authority for the assertion that 

 a single moth may deposit over 500 eggs. 



The time for the egg to hatch after it is deposited has not been 

 ascertained, but is supposed to be from two or three days to a week. 



THE LARVA. 



When full grown the larva of Heliothis armigera is 1.50 inches 

 long, nearly cylindrical, being a little thicker through the middle 

 than at either extremity. There are two varieties of color; a green 

 and a brown form, the variation seeming to have no relation to sex 

 or age. In general color the first is a little paler than grass-green, 

 with three stripes of darker green, which are arranged as follows : 

 a narrow dorsal line, and, just below the sub- dorsal region, one on 

 each side that reaches three-fourths of the distance from the sub- 

 dorsal to the stigmata, or occupies the upper three-fourths of the 

 sub-dorsal space. Under the glass the whole body above the stig- 

 mata is seen to be marked with fine greenish-white, longitudinal 

 lines. The dorsal one of these fine lines is unbroken only at the 

 intersection of the joints. The sub-dorsal fine line can be traced 

 just above the lateral dark-green stripe, but is broken into from 

 four to six parts on each jomt. Between these two, or the dorsal 

 space, there are five broken and somewhat irregular lines, the first 

 bordering the outside of the dorsal dark-green stripe. On some 

 joints these lines are not easily traced, but they can be on most of 

 them. Along the stigmata there is a broad, pale, greenish-white 

 stripe, bordered below by the sub-stigmatal line, which is more dis- 

 tinct greenish-white. This line comes lower down on the middle of 

 each joint than at the ends, making a series of scallops instead of 

 a straight line. The stigmatal stripe is mottled with pale green, 

 but these mottlings cannot readily be traced into lines as they can 

 in the dorsal space. The lateral dark stripe is also mottled with 

 pale greenish-white, but not easily traced as lines. In the upper 

 edge of this stripe, in the middle of each joint, next to the sub- 

 dorsal line, is a small, purplish spot mottled with white ; stigmata 

 salmon, ringed with black ; piliferous spots variable. The following 

 are prominent and shining : those just above the stigmata and those 

 on the dorsum of joint 11 ; the rest are scarcely noticeable. Those 

 above the stigmata on joints 2 and 3 are black, but all the rest are 

 the ground color, with a single short, brownish hair arising from 

 each. Sub-stigmatal space the ground or general color; the venter 

 whitish ; legs green, the claws brown. Head ochraceous, mottled 

 a little with greenish, especially in front; clypens pale; jaws dark- 

 brown, each jaw with three strong teeth; on the side of the head 

 there are five brown dots on the ocelli in a line from the labrum 

 obliquely upwards. The cervical shield covers nearly all of the top 

 of joint 1. There is a fine, short pile, seen only under the glass, 

 that covers the whole of the body. This is white where there are 

 greenish- white markings, but is black elsewhere. 



