10 
what lighter; abdomen the same color, with an 
ocher shade. Front wings medium gray, sprinkled ^ 
with blackish scales, crossed near the tips by 
two wavy angular blackish lines; a W-shaped 
transverse line about one third the way from 
the base; a black dot in the center, which is 
sometimes double. (See Fig. 2, g.) The hind? 
wings are semi-transparent, of a silvery luster, with \ 
a darker border. Both pairs of wings are heavily 
fringed. (See Fig 1, a.) 
The egg, plainly visible to the naked eye, is 
elongated oval in outline; greasy whitish in color 
when first laid, becoming darker as the embryo 
matures within; and varies considerably in length 
and breadth, as shown by the following measure¬ 
ments made from four different lots of eggs: 
Fio. 'll.— Pri n c i p a 1 
markings and venation 
of wings. (After Snell¬ 
en.) 
First lot, laid April 12, 1895—Length, 0.432 mm.; breadth,0.204 mm. 
Second lot, laid April 17, 1895—Length, 0.480 mm.; breadth, 0.240 mm. 
Third lot, laid May 5,1895 —Length, 0.408 mmbreadth,0.228 mm. 
Fourth lot, laid June 19. 1895—Length,0.444 mm.; breadth,0.216 mm. 
This variation in size occurs also in eggs of the same lot. The 
general average length is 0.441 mm., and the breadth 0.222 mm. 
The surface is irregular and has a crumpled appearance. 
The larva (Fig. 1, c) when first hatched is very small, being 
only 1.083 mm. long, with a body diameter of 0.19 mm; head 
slightly larger, measuring 0.247 mm.; flesh-colored, varying from 
a whitish to a pinkish tint; head reddish brown; legs and pro¬ 
legs a little lighter colored than body; body sparsely hairy, hairs 
longest on the posterior segments, often measuring there 0.342 
mm., but about 0. L14 mm. on the other segments. When full 
grown the larva varies from 12 to 14 mm. in length; form cylin¬ 
drical, somewhat slender, with a rather uniform diameter of about 
2 mm.; color as earlier, the pinkish tint more pronounced in 
some than in others. Three pairs of true legs, and a well-developed 
caudal pair; abdominal legs long, cylindrical, with a circular fringe 
of hooklets at the crown. Piliferous warts black or brown, rather 
minute but prominent; lateral ones more conspicuous in front of 
the first spiracle, the subdorsal ones, one each side of the meso- 
thorax, almost completely encircled by a narrow black ring inter¬ 
rupted only at its upper margin. Each segment has six bristle¬ 
bearing dots, four of which are conspicuous and two smaller; a 
transverse reddish-brown patch on the segment next the head, 
divided, from front to back, by a faint central line; surface of body 
rather smooth. 
The chrysalis (Fig. 1, d) varies from 9 to 10.5 mm. in length, 
and from 2.5 to 3 mm. in width. Oddish brown above, the head 
and thorax being darker than the rest of the body, much lighter 
below, the shade becoming lighter from the head back, approach¬ 
ing a yellowish tint on the wing-pads and abdomen; posterior 
part slightly curved and cylindrical; tip of the last segment con¬ 
siderably darker than the rest of the body and furnished with 9 
