244 
MEMOIKS OF THE NATIONAL ACADEMY OF SCIENCES. 
Egg, — Diameter^ 0.9 mm. Of the usual hemispherical shape, moderately flattened above; shell 
under a lens seen to be finely pitted or shagreened; under ^-inch, A eyepiece marked with rather 
large hexagonal areas, Avith well-marked raised edges, but not distinctly beaded. The hole eaten 
on one side by the larva, iu escaping, of the usual elongated kidney shape. 
Larva^ Stage 7. — Freshly hatched. Length, 3.o mm. Head very large, much wider than the 
body, somewhat flattened in trout; pitchy amber, smootli, unarmed, surface dull, not polished. 
On the first thoracic segment arising from a dark cervical ])late is a pair of large branching horns 
with three large efiual curved tines, which are pointed and densely spinose; the sliort, stout 
spinules dark, quite different from 77 guttivitta. One tine points forward, one backward, and one 
laterally outward. The body is i)urplish reddish, with no stripes or other marks, except a small 
pale yellowish transverse dorsal spot in front of the 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 setm; 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 i)airs of middle abdominal legs dark livid. It 
molted July 27, (In Fig. 83 the setm are not in every case correctly drawn.) 
Stage IL — Length, 0 mm, Jlead 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 supidementary 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 au oak 
twig, variegated with yellowish; a distinct linear dorsal line and a broad diffuse line on thoracic 
segment; aii'irregular series of large dorsal yellowish spots, those on abdominal segments 1 to 4 
and G, 7, and 9 being the largest. Anal legs moderately long, reddish. It molted August 1. 
Stage III, — Length, 8-9 mm. The liead is now large, wider than the body, subtrapezoidal in 
front, rounded above, and slightly bilobed; pale iu front, yellowish on the sides. An irregular 
pale reddish brown baud on the A^ertex and oji the sides inclosing iu front four irregular reddish 
spots of the color of a dead leaf which may be called sere-brown. Prothoracic spines uoav stout 
and pale reddish, endiug iu three black spines. From each spine i)roceeds a broad reddish broAvii 
band, the color of a dead leaf, and inclosing a large o\ml yelloAvish spot AA^hicli extends along the 
back of abdominal segments 1 to 4. The spot incloses tAvo reddish lines A\iucli dilate four times, 
inclosing a roundish white spot in each dilatation. Ou segments 7 and 8 is a long triangular Avhitish 
spot, inclosing Iaa'o short reddish lines which dilate twice, inclosing two narrow oval spaces. The 
back of segments 8 and 9 is reddish, the sides yellowish green, Avhitish; anal legs held up Avhen 
at rest, greenish, with a red strix)e within. The reddish i)ortion of the body consists of irregular 
fine redbush and greenish yellow lines, the former predominating. It molted ou the morning of 
August S, and ate up the cast skin before beginning to feed upon the oak lea\*es. 
Stage IV. — Length, 12 mm. (Two days before the molt the lateral sere-browii spots appeared 
as iu this stage, but fainter.) By August 12 it had become 20 mm. iu length. The three prongs 
of the prothoracic Sonnes 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 greeuish 
portion of the sides speckled Avith black. Dorsal spots as before, au irregular lateral sere-browu 
spot just above the base of the thii*d thoracic legs, and still higher up ou first abdominal segment 
is a contiguous spot, making au oblique band, as in the other species. The reddish broAvn edging 
of the diamond-shaped dorsal spot ou abdominal segments 1 to 4 extends doAvn to the base of 
the first pair of the abdominal legs. In this stage there is present a straw-yellow iufraspiracular 
line, just touching the spiracles, aud best marked ou the abdominal segment, and above ou the 
second thoracic segment are similar yellow lines, not reaching the front edge of the iirothoracic 
segment nor extending behind the oblique sere-brown band. 
Stage V and last , — Described August 29. Length, 40 mm. Now there are no prothoracic 
tubercles, but iu place of each of them a very slight, elongated, flattened callosity. Head rounded, 
not so wide as the body; luteous Avith a flesh tint and slightly purplish; au ashy irregular baud 
