1P90.] 
557 
[Packard. 
its apex resting on the hinder edge of the second thoracic seg- 
ment. An oval lilac-red spot edged with yellow on the hind edge 
of the third thoracic segment separated by the suture from a simi- 
lar spot on the first abdominal segment, but which is three or four 
times as large. A transversely sub-elliptical similar spot on the 
second abdominal segment twice as large as the one in front, suc- 
ceeded by a much wider one on abdominal segments 3 and 4 ; that on 
the fifth segment is of the same size as that on the second. On the 
sixth abdominal segment is . a transversely oblong spot. (These 
spots were all connected in Edwards’ and Elliot’s specimens.) 
Along the back of segments 7 to 10 is an elongated dumb-bell- 
shaped spot, the contraction in the middle of the spot occurring on 
the back of the eighth segment ; the spot terminates on the end of 
the suranal plate, which is squarely docked at the end. 
The stemapods, or anal filamental legs, are reddish at the base 
above and beneath, with two pale rings beyond the middle ; the 
flagellum being reddish-lilac. There is a lilac-red spot at the base 
of the thoracic and abdominal legs, one near the origin of each leg, 
and one on the sides of abdominal segments 7-9 ; besides these red- 
dish lilac dots are elsewhere scattered over the sides of the body. 
The paranal lobes and the excrementiferous bristles are well devel- 
oped. 
This species differs from C. borealis and occidentalis in the less 
connected and narrower dorsal lilac-red patches, and in the end of 
the suranal plate being squarer, that of O. occidentalis being some- 
what rounded behind. It is more nearly allied to C. occidentalis 
than to G. borealis. 
Pupa . — In the absence of those of the other species for compar- 
ison it can only be observed that the end of the body is perfectly 
rounded and obtuse, with no trace of a cremaster. It is evident 
that in this genus, owing to the fact that the pupa is enclosed in a 
dense perfect cocoon, with no chance of its falling out, the cremas- 
ter by disuse has completely disappeared : and it is not improbable 
that the abolition may have occurred with comparative suddenness. 
RECAPITULATION OF THE MORE STRIKING FEATURES IN THE ONTOGENY 
AND STRUCTURE OF CERURAL. 
1. The larva hatches with fully developed stemapoda (filamental 
legs), indicating that the genus, so peculiar in this respect, has de- 
scended with little modification from some preexistent type, and 
not directly from a Platypteryx-like form. 
