INSECTS INJURIOUS TO THE FIR TREE. 239 
brown, mottled with yellowish or reddish brown; with four black rounded button- 
like tubercles arranged in a trapezoid on the top of each segment. Length 18™™. 
14, THE FIR HARLEQUIN CATERPILLAR. 
Order LEPIDOPTERA; family NoctTurp”®. 
Late in summer in Maine, feeding on the leaves of the fir and spruce, a singularly 
humped and spotted caterpillar, with four pairs of abdominal legs. Body short, much 
swollen on the second ring behind the head and the first abdominal segment, and 
humped between the last and the penultimate abdominal legs. Head very small, striped 
with black. Ground tint a wood color mottled with gray and black, with scattered 
white spots. An irregular lilac dorsal band. A pair of conspicuous white dots on the 
hump behind the head, and another pair on the posterior hump. Body very much 
varigated in tints and it is difficult to describe briefly all the details of the markings. 
Length 12-14™™, This singular caterpillar is not infrequently beaten off from the fir 
and spruce. It was observed late in August. 
15. THE WHITE-LINED CATERPILLAR. 
Order LEPIDOPTERA; family NOCTUID&. 
Feeding on the leaves of the fir in August in Maine, a larva of the usual Noctuid 
form. Head nearly as wide as the body, smooth; body rather thick, smooth, pale 
pea green. A dorsal somewhat broken snow-white line, and two wider subdorsal ones. 
A broken bright red lateral line, edged below with white and yellowish. Ends of all 
the legs reddish. Length 22™™., 
16. THE TUSSOCK MOTH. 
Orgyia leucostigma Smith-Abbot. 
Order LEPIDOPTERA; family BOMBYCID”®. 
Feeding on the leaves of the fir in July and August in Maine, a hairy caterpillar 
with two black pencils of hairs in front; one median, one behind; four medio-dorsal 
short thick yellow tufts, succeeded by three dorsal coral-red tubercles on the back. 
Fic. 91. The tussock caterpillar. Nat size.—After,Riley. 
Fic. 92.—The tussock moth; a, female; ec, male; c, female pupa; d, male pupa; b, freshly-hatched larva 
Nat. size.— After Riley. 
