THE LARCH LAPPET MOTH. 895 



Larva, third stage. — The second molting commenced seven days after the earliest of 

 the first, and continued until May 9, thus overlapping the first molt. The molts re- 

 corded (eight not observed) are as follows : 



Larvse. 



May 6 I 



May 8 1 



May 9 2 



Total 25 



Larvse. 



April28 1 



April29 1 



April 30 4 



May 1 5 



May 2 6 



May 5 4 



Immediately following this molting, the larva measures 0.55 inch. The frontal white 

 lines of the head are more convergent, approaching a \/, and some confluent lateral 

 lines are seen resembling a B (not well shown in the figure), the brown portions are 

 distinctly mottled, and numerous white hairs are given out from beneath the white 

 transverse band (Fig. 18). The color and markings of the body are nearly as in the 

 preceding stage. The subdorsal tubercles are more prominent and are slate colored 

 apically ; two or three long black hairs proceed from each in a horizontal direction. 

 The short, gray lateral hairs are now so numerous that they form a fringe to the body, 

 which, as the larva rests on a leaf of the pine, were downward and inward, so that 

 some of the tips meet underneath. The subdorsal stripe is geminate, marked with 

 orange opposite each tubercle. The tubercles of the third segment are more promi- 

 nent than the others. 



Larva, fourth stage. — The third molting, as in the second, commenced seven days 

 after the earliest of the preceding molt, on May 5th, when but about two- thirds of the 

 larvae had undergone their second change. Of the duration of this molt, or of the 

 dates of molting, no record was kept. 



The larvae show the following dorsal markings : Resting on segments 3 and 4, a 

 sublenticular yellow spot, bordered with velvety black, and bisected by a narrow, 

 brown mesial line; on segment 7, a yellow spot, of which the anterior portion is split 

 by a wedge-shaped brown projection — its greatest breadth between the tubercles, ex- 

 tending on segment 8 and terminating in a point between the tubercles of this segment. 

 In some examples a somewhat similar shaped spot of paler yellow is seen on segment 

 9, extending a little on segment 10. The yellow lateral markings, which in the former 

 stage formed an interrupted line below the tubercles, are reduced to a series of indis- 

 tinct ochreous spots at the base of each tubercle. The cylindrical tubercles ou seg- 

 ment 3 are quite projecting and rounded at the tip ; the subdorsal tubercles present 

 the following ratio of size in the order of their occurrence : 1, 2, 7, 9, 6, 10, 5, 4, 12, II, 

 8, 3, (that on segment I being the largest, and on segment 9 the smallest). The 

 subjoint of segment 12 has two elevated black points. The barbed gray hairs com- 

 posing the fringe have some barbless ones mingled with them. The legs are luteons, 

 marked with black exteriorly, and are nearly hidden by the overlapping fringe. 



Beneath, on segment 2, are three small mesial spots; on segment 3 are two spots; 

 on the following segments an obscure, larger one mesially on each ring ; the body 

 ventrally is marked with crinkled lines. 



Previous to the fourth molting the larvae measure 1.2 inch. The 8th tubercle in 

 the subdorsal row is conical ; the 11th has a broad base, extending anteriorly to the 

 incisure. Upon the first five segments the barbed hairs of the fringe are more nu- 

 merous. 



This stage, as was ascertained later, was the last larval stage of a portion of the 

 brood ; a part entered upon a fifth stage. The head of these, taken from cast head- 

 cases at their fourth molting (enlarged to six diameters, as the preceding ones), is rep- 

 resented in Fig. 19. 



Mature larva. — The largest attained a length of nearly one inch and a half. The 

 color is a dull brown, resembling that of the bark of the pine twig. The head is cov- 

 ered with black hairs superiorly, and with gray hairs anteriorly. When extended, the 



