244 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Egg. — Diameter, 0.!) mm. Of tlie usual hemispherical shape, moderately flatteued above: sliell 

 under a lens seen to be finely pitted or sha<;reeiie(l ; under .1 inch, A eyepiece marked witli rather 

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

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



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

 bod}% somewhat flattened in i'ront; pitchy amber, smooth, unarmed, surface dull, not i)()lislied. 

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

 with three large eipial curved tines, which are pointed and densely spinose: the short, stout 

 spinules dark, quite different from If. giittirittii. One tine points forward, one backward, and one 

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

 pale yellowish transverse dorsal S]>ot in front of tlie base of the 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 seti^e; on third a jiair 

 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 tiie 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, (5 mm. Head reddish brown. Now all the horns have (lisa])peared, 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 si)ines are wide ajiart and project out laterally. On ninth abdominal segment 

 are two twin minute black si)inules 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 abdonn'nal 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 si)ines now stout 

 and pale reddish, ending in three black spines. From each spine proceeds 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 -1. The spot incloses two reddish lines which dilate four times, 

 inclosing a roundish white spot in each dilatation. On segments 7 and 8 is 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 tiie lateral scre-browu 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; 111, but the greenish 

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

 spot just above the base of the third thoracic legs, and still higher up on first abdominal segment 

 is a contiguous spot, making an oblicpie 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 i)air 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 baud. 



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

 tubercles, but in i)lace of each of them a very slight, clongattMl, flattened callosity. Head rounded, 

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



