26 NEW YORK STATE MUSEUM ~ 
a few conspicuous yellowish setae, the antennae short, yellowish 
at the base, the basal segment yellowish, the second segment pro- 
longed, reddish yellow, narrowly yellowish at the extremities and 
with a few coarse setae apically; mandibles reddish brown, fuscous 
apically, irregularly bidentate; labial palpi three jointed, mostly 
pale yellowish, spinneret pale yellowish. True legs a variable yel- 
lowish and reddish brown, the distal segments somewhat darker, 
the first pair of prolegs dark brown basally, yellowish brown 
apically, the anal prolegs mostly yellowish brown, venter nearly 
the same color as the dorsum, except that portion between the 
prolegs, which is a variable yellowish green and yellowish brown. 
Pupa. The pupae are found among the leaves, being sheltered 
by a very light, thin, yellowish brown cocoon. The pupa is about 
1 inch long, the general color being a yellowish brown, irregularly 
spotted with dull black. Antennae, leg and wing sheaths closely — 
fused and extending to the tip of the fourth abdominal segment, 
the terminal segment pale yellowish or yellowish straw ; cremaster 
composed of an irregular group of four stout, dark brown, re- 
curved hooks, two distal, two subapical and then two pair of more 
slender ones, the more distal being lateral and the others dorsal. 
The adult [pl. 1, fig. 1] is a rather slender bodied, usually snow- 
white insect having a wing spread of about 1'4inches, the female 
being a little larger. This moth, according to Professor Packard, 
may be at once known by its snow-white body and wings, the 
angulated forewings and notched hind wings. 
Life history. The eggs of this species are deposited usually 
on the underside of the branches and remain unhatched till the 
following spring. The young measuring worms appear with the 
unfolding foliage and, when abundant, trees may be defoliated 
within two weeks. ‘The caterpillars attain full growth in five or 
six weeks. The investigations of the outbreak in Ulster county 
were made July 26, at which time most of the caterpillars were 
full grown and some had even entered the pupal stage. The final 
transformations are usually undergone within a shelter of leaves 
drawn and fastened together with silken strands. Adults were 
bred from the specimens taken in the Catskills July 31 and August 
1. The eggs are deposited shortly thereafter, and in the North 
at least, remain unhatched till the following spring. Professor 
Comstock states that many eggs in the Georgia outbreak were 
deposited on leaves, and this led him to conclude that in the South 
there was probably more than one generation annually. 
