36 NEW YORK STATE MUSEUM 
placed ocelli. There is a narrow, irregular, dark-brown line at the 
lateral dorsal angles of the head case, a small, black, fuscous spot 
ventrally anda pair of small, subtriangular, black spots sublaterally. 
Antennae moderately prominent, mostly yellowish brown, slightly 
fuscous apically. Thoracic and abdominal segments mostly a uniform 
yellowish, the true legs pale yellowish and having the second segment 

Fig. 6 Apple and thorn skeletonizer, dorsal 
or top view of a typical pale greenish cater- 
pillar. The spots on this specimen are about 
the average size. (X 6) (Author’s illustration) 
fuscous and the distal segment much more slender, tapering and 
with a distinct claw apically. There are well-developed cylindrical . 
abdominal! segments, each leg when extended with a length approx- 
imately three times its diameter. The tubercles are a pale fuscous 
or fuscous, depending on the age of the caterpillar, each bearing one 
or two moderately long hairs. 
Older larvae with a length of about three-sixteenths of an inch 
are decidedly darker, though the general color is practically the 

Fig. 8 
Fig. 7 Apple and Apple and 
thorn skeletonizer, head 
and first two body seg- 
ments of the caterpillar, 
showing the arrange- 
ment of the warts or 
tubercles and the struc- 
thorn skeletonizer, side 
view of asmaller, darker 
caterpillar. Note the 
relative size of the 
black warts or tubercles. 
(X 12) (Author's illus- 
tration) 
ture of the legs. (X 10) 
(Author's illustration) 
same. The tubercles are much larger and in some specimens almost 
confluent, so as to give the appearance of submedian black lines, 
though in reality they are simply series of closely set tubercles. 
The thoracic legs have a shade of fuscous on the apical portion of 
the basal segment, the second segment is black and the third prac- 
tically as in the earlier stage. 
Full-grown caterpillars have a length of nearly one-half of an inch 
and present practically the same characteristics as given above, 
