THE CANADIAN ENTOMOLOGIST. ol 
intensely black, and clothed with crowded short black hairs, intermixed - 
with scattered long ones ; on each side of the median stripe is an equally 
broad jet black stripe, and in this on every segment, from the fifth to the 
twelfth both inclusive, are two transverse bright red spots, with two minute 
whitish warts between’ each pair, the warts emitting black bristles; below 
the black stripe on each side is a broad gray stripe, emitting gray hairs, 
and including the black spiracles; this gray stripe is reddish on the 
anterior segments, the intensity of the red increasing towards the head. 
The belly, legs, and claspers are dingy flesh coloured. It feeds on white 
thorn, pear, and a variety of other trees.” 
The long, intensely black hump on the fifth segment, which is a very 
striking characteristic in fs, is entirely wanting in occidentalis, the color- 
ation also is very different, the broad median yellow stripe, in the former 
from sixth to twelfth segments is also wanting in the latter. The circular 
black patches in the American species is represented in the European 
insect by a broad black stripe bordering the equally broad yellow one, the 
grouping and color of the clusters of small dorsal spots on each of these 
segments is also very different. In fsz the black is bordered with a broad 
gray stripe becoming reddish on anterior segments, while in occidentalis 
the same portion is covered with two narrower cream colored stripes, 
becoming less distinct on the anterior segments. Many other minor 
points of difference might be educed, but these, we think, are sufficient 
to show that in the larval state these species are widely diverse. 
The imago of occidentalis is said by Mr. Grote (see Proc. Ent. Soc. 
Phila., vol. 6, p. 16,) to differ from sz, “‘by the paler color of primaries, 
which are more sparsely covered with scales, and their somewhat squarer 
shape. The reniform spot on the disk shows a bright testaceous tinge, 
and the ordinary spots are less approximate than in #54 The secondaries 
are dark grey, nearly unicolorous, a little paler in the male, and darker in 
either sex than its European analogue.” 
After a careful comparison of a number of bred specimens with the 
European insect we fail to see the validity of most of the distinctive 
points urged by Mr. Grote. We have found the color of primaries to 
vary much, in some examples they have been darker, but in the majority 
they have been fully as light as those of fsz } nor can we see any difference 
in uninjured specimens with regard to the density of the scale covering. 
In some the wings are somewhat squarer, but it is a difference scarcely 
perceptibie, and in other examples we have failed to detect it. The testa- 
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