THE CANADIAN ENTOMOLOGIST. — 47 
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young larva is much broader than high, and the body profusely furnished 
with conical warts, arranged, to a certain extent, in clusters, which are in 
eight longitudinal rows, continuous on the thoracic and abdominal seg- 
ments, each wart emitting a very long, tapering, spiculiferous hair, expand- 
ing into a delicate cup-shaped club at the tip. In the mature larva, the 
head is equally broad and high, and the body furnished with six longi- 
tudinal rows of simple, not clustered, mammule, differently disposed on 
* the thoracic and abdominal segments, each mamula bearing a stout, fleshy, 
conical, bluntly tipped, aculiferous process. 
In Mélitea, the head of the immature and adult larva scarcely differ. 
In the younger stages, the body is equal, excepting that the posterior half 
tapers slightly ; in the older period it is also nearly equal, but tapers 
forward a little on the thoracic segments. Besides this, we find differences 
similar to, but even greater than, those referred to in Grapéa. In the 
embryonic larva, the body is furnished with small warts, giving rise to 
rather short, tapering hairs, all arranged in five pairs of rows, three of 
them above, one on a line with, and one below, the spiracles. In the 
mature form, the hairs have given place to stout tapering spines, each 
supplied with many aculiferous, conical wartlets, and arranged in a median 
dorsal series and four pairs of lateral rows, two above and two below the 
spiracles. 
If we next turn our attention to the Zycenide, we shall find similar 
differences. While the form of the head and body remain nearly the 
same from youth to maturity, the contrasts between the dorsal and lateral 
surfaces of the body are more pronounced in the early stage, both from 
' the greater flattening of the upper field, and from the presence, at the line 
of demarcation between the two, of a series of warts, emitting hairs, some 
of which are exceedingly long, and curve backwards ; similar hair-bearing 
warts are present along the fold dividing the lateral and the ventral 
regions, while there are one or more longitudinal rows of simple warts 
along the sides. The different groups, the Zhe/e, Lycene, and Chrysc- 
phani, can be distinguished by the number of warts to a segment in each 
of the first-mentioned rows, and by the character of the hairs borne by 
them. In the full-grown larva, the linear series of warts are wanting, but 
the whole body is covered with microscopic hairs, seated, in Zycena, on 
stellate dots, and which are only slightly, if at all, longer upon the angles 
of the body. 
In the Papilionide, again, we find no differences of importance in the 
shape of the head, but some peculiar features in the armature and form of 
