CATERPILLARS OF THE FIR. 867 
flesh tint, with 8-10 blackish -brown lines on top of the body. Head reddish, mottled 
with dark brown. On the side of nearly each segment a pair of dark acute tubercles 
and below the bright straw-yellow lateral ridge (the line is broken in fully grown 
larvae) is a black irregular flattened broad eminence. Supra-anal plate large, project- 
ing far behind and, like the pair of anal legs, flesh red. Body beneath deep flesh- 
colored, with dark linear stripes. Length of body 20 r 
mm 
This caterpillar, which may be recognized by its slender body, with 
8-10 dark lines, the broken lateral straw-yellow line, and the large 
rounded deeply incised head, is common not only on the fir, but also on 
the spruce and hemlock late in August and early in September in 
Maine. In fully grown caterpillars on each segment of the body are two 
high rounded subdorsal and two larger lateral tubercles, which are 
reddish flesh-colored tipped with black, and there are two rounded 
supra-anal tubercles. This caterpillar is infested by a Microgaster, a 
single one of these small ichneumon larvae issuing from the body and 
spinning a cocoon during the last week of August. The same cater- 
pillar is described under Pine insects No. 112, p. 784. 
18. Geometrid caterpillar. 
This caterpillar occurred on the fir, June 27 to 29, 1885. It pupated 
about July 6. Pupa quite different from that of Thera : 
Larva. — Body rather full and thick. Head smooth, somewhat bilobed, well rounded, 
not quite so wide as the body. Head and body green, a deeper tint than the upper 
side of a fir leaf. Two linear subdorsal pale yellow lines, and a broader lateral deeper 
straw-yellow line. Anal legs no larger than the pair in front. Length, 18 mm . 
19. Geometrid caterpillar. 
This caterpillar occurred on the fir, July 1 to 12, 1887. It pupated 
July 30-31: 
Larva.— Head flattened ; slightly bilobed, as wide as the body. Body slender, thick- 
ening a little towards the eighth abdominal segment. On end of fourth abdominal 
segment two large tubercles with a regularly curved whitish line in front. A pair 
of similar piliferous dorsal swollen tubercles on eighth abdominal segment. Other 
abdominal segments with four minute dark dorsal tubercles. Color of head and body 
like a small dead fir twig, marbled and lined with gray and black-brown. Supra-anal 
plate light-colored, with six piliferous tubercles and supra-anal tubercles of the legs 
large and swollen, conspicuous. Anal legs rather large. Length, 35 mm 
20. Geometrid caterpillar. 
This caterpillar has the head rounded, is like a twig, and is quite un- 
like any other species. It occurred at Brunswick, August 30 to 31, on 
the fir : 
Larva. — Head moderately large, not quite so wide as the body, which is moderately 
thick. Head rounded, somewhat bilobed, the lobes well rounded, marbled. with red- 
dish. Body smooth, a small double hump on the penultimate segment, and the 
mesothoracic segment is somewhat swollen on each side, while the lateral line is 
rather prominent. General color is dark wood-brown, the head reddish and the body 
