INSECTS INJURING OAK-LEAVES. 15& 
with a pale and dark shade, the vascular line dark and broken. Many of these are 
now crawling about quite actively, while others are in the pupa state and others 
issuing. They were all in a very slight elastic silken cocoon. 
September 20, 1874 : A number of all sizes on oak, separated into three lots — a in cage 
12 ; & in cage 10 ; c in cage 5. They are very variable and there are specimens inter- 
mediate between these three forms. Some have the colors very bright and distinct, 
and others less so. A lot found on linden, but afterw ards feeding well on oak, are all of 
the light form a in cage 13. 
November 21, 1874: In sieving the cages containing forms a, b, and c, they were 
found still in the larval state, some having made a tough silken cocoon, others one 
made only of a few threads, while some had no cocoons at all but had made a smooth 
cavity in the earth. In cage 5 were found two large Tachina larvae, certainly from 
form c, one of which is preserved in box 7-40. April 10, 1875, one Tachina fly is- 
sued marked 359°. One moth issued April 16, 1875, the larva of which was found on 
linden, but fed also on oak in cage 13, where there are many more in the ground. 
Braconid parasite bred October, 1874. October 26, 1875: Nine from oak all near 
form b. (Unpublished notes.) 
Full-grown larva — Variety a. — Length, 40 mm (l. 50 inches), rather slender, subcylindri- 
cal. Head pale green with a deep purplish lateral line bordered below with a pure 
white line; dorsum of abdomen bluish-green with a narrow white dorsal line; the 
green dorsum is bordered each side by a narrow, scarcely noticeable yellow line run- 
ning from the head to the fourth segment, from which point it is purple to the end of 
the body ; this line is bordered below by a very distinct pure white subdorsal band ; 
the sides are bluish with dark purplish spots ; stigmata orange ; below the stigmata 
a faint interrupted yellow band ; the dorsal aud lateral piliferous warts are yellowish ; 
subdorsal whitish. The first thoracic segment has two jellow dorsal tubercular spots; 
segments 2 and 3 have each a yellow dorsal double wart, and the first abdominal 
segment has two quite conspicuous red piliferous tubercles; the penultimate segment 
is somewhat gibbous above and bears two small reddish piliferous tubercles. 
Variety b. — Head dark yellow; dorsum of body purplish with paler mottlings; 
dorsal line white; the subdorsal white line interrupted on abdominal segments 3 and 
6; the sides rather browner than the dorsum; lateral line yellow and more distinct 
than in variety a. Stigmata orange ; the first thoracic segment has the yellow tuber- 
cle, but segments 2 and 3 have only the lower one of the double tubercles yellow. In 
other points it resembles variety a. 
Variety c. — Head very pale yellow; dorsum pale grayish; dorsal white line bor- 
dered each side by a narrow purplish line. The subdorsal band consists of a narrow, 
purple line, an indistinct yellow line, aud a broad white band; the subdorsal lines 
approximate on the thoracic segments as in other varieties; the lateral line is yellow, 
distinct, and uninterrupted; sides slightly darker than the dorsum aud specked with 
purplish spots. (Comstock, U. S. Ag. Report for 1880.) 
217. Heterocampa pulverea Grote and Robinson. 
Order Lepidoptkra ; family Bombycuxe. 
Professor French has reared this caterpillar, which occurred in Union 
County, 111., June 30 ; July 6 it went into the dirt of the breeding-cage 
to pupate, the moth appearing August 6. 
The caterpillar.— Leu gth, 1.25 inches [in shape tapering slightly from the middle 
forward, but more rapidly from that point backward, the body deeper than broad.] 
.General color bright green, head gray, first segment behind the head with two dark 
purplish-black dorsal warts; from these a purplish-brown line extends backw'ard. 
This purplish-brown color extends over the back part of the sixth segment, the whole 
of the seventh, and most of the eighth. On the third segment begins a dorsal orange- 
patch, which reaches back to the sixth segment, filling the space between the purple 
lines. On the ninth segment is another orange-patch. The tenth segment has no 
