244 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Egg. — Diameter, O.i) luiii. Of the usual hemispUeiical shape, moderately flatteued above; shell 

 under a lens seen to be finely pitted or sbagreened; under ^-incb, A eyepiece marked with rather 

 large hexagonal areas, with well-marked raised edges, but not distinctly beaded. The hole eaten 

 on one side by the larva, in escaping, of the usual elongated kidney shape. 



Larva, Stage I. — Freshly hatched. Length, 3.5 mm. Head very large, much wider than the 

 body, somewhat flattened in front; pitchy amber, smootli, unarmed, surface dull, not polished. 

 On the first thoracic segment arising from a dark cervical plate is a pair of large branching horns 

 with three large equal curved tines, which are pointed and densely sjjinose; the short, stout 

 spinules dark, quite different from H. guttivitta. One tine points forward, one backward, and one 

 laterally outward. The body is purplish reddish, with no stripes or other marks, except a small 

 pale yellowish transverse dorsal spot in front of the base of tlie eighth segment. No horns on the 

 second and third thoracic segment. On first abdominal segment is a pair of simple dark horns 

 about as long as the segment is thick. On second segment a pair of minute setse; on third a pair 

 of blunt spines one half as long and large as those on first segment. A pair on eighth segment 

 two-thirds as long and large as those on the first, and a slightly smaller pair on the last (tenth) 

 segment. End of body carried uplifted, and the two cylindrical anal legs blunt at the end and 

 entirely dark. Thoracic legs blackish; the four pairs of middle abdominal legs dark livid. It 

 molted July 27. (In Fig. 83 the seta^ are not in every case correctly drawn.) 



Stage II. — Length, G mm. Head reddish brown. Now all the horns have disappeared, those 

 on the first thoracic segment only represented by two conical acute tubercles, which are black at 

 the tips and slightly forked, there being a small black supplementary spine on the inside of the 

 main one. The two spines are wide apart and project out laterally. On ninth abdominal segment 

 are two twin minute black spinules situated close together. Body pale reddish, color of an oak 

 twig, variegated with yellowish; a distinct linear dorsal line and a broad diffuse line on thoracic 

 segment; an irregular series of large dorsal yellowish spots, those on abdominal segments 1 to 4 

 and 6, 7, and 9 being the largest. Anal legs moderately long, reddish. It molted August 1. 



Stage III. — Length, 8-9 mm. The head is now large, wider than the body, subtrapezoidal in 

 front, rounded above, and slightly bilobed; pale in front, yellowish on the sides. An irregular 

 pale reddish brown band on the vertex and on the sides inclosing in front four irregular reddish 

 spots of the color of a dead leaf which may be called sere-brown. Prothoracic spines now stout 

 and pale reddish, ending in three black spines. From each spine ])roceeds a broad reddish brown 

 band, the color of a dead leaf, and inclosing a large oval yellowish spot which extends along the 

 back of abdominal segments 1 to 4. The spot incloses two reddish lines which dilate four times, 

 inclosing a roundish white spot in each dilatation. On segments 7 and 8 i§ a long triangular whitish 

 spot, inclosing two short reddish lines which dilate twice, inclosing two narrow oval spaces. The 

 back of segments 8 and 9 is reddish, the sides yellowish green, whitish; anal legs held up when 

 at rest, greenish, with a red stripe within. The reddish portion of the body consists of irregular 

 fine reddish and greenish yellow lines, the former predominating. It molted on the morning of 

 August 8, and ate up the cast skin before beginning to feed upon the oak leaves. 



Stage IV. — Length, 12 mm. (Two days before the molt the lateral sere- brown spots appeared 

 as in this stage, but fainter.) By August 12 it had become 20 mm. in length. The three prongs 

 of the prothoracic spines as in Stage III, reddish. Head a little broader and rounder than before, 

 but with the same style of markings. The markings of the body as in Stage III, but the greenish 

 portion of the sides speckled with black. Dorsal spots as before, an irregular lateral sere-brown 

 spot just above the ba.se of tlie third thoracic legs, and still higher up on first abdominal segment 

 is a contiguous spot, making an oblique band, as in the other species. The reddish brown edging 

 of the diamond-shaped dorsal spot on abdominal segments 1 to 4 extends down to the base of 

 the first pair of the abdominal legs. In this stage there is present a straw-yellow infraspiracular 

 line, just touching the spiracles, and best marked on the abdominal segment, and above on the 

 second thoracic segment are similar yellow lines, not reaching the front edge of the prothoracic 

 segment nor extending behind the oblique sere-brown band. 



Stage V and /r/.s/.— Described August 29. Length, 40 mm. Now there are no prothoracic 

 tubercles, but in place of each of them a very slight, elongated, flattened callosity. Head rounded, 

 not so wide as the body; luteous with a flesh tint and slightly purplish; an ashy irregular band 



