Packard.] 
490 
[Feb. 19, 
pieces of dead, dry, yellowish leaves which had fallen upon and be- 
come fastened to the surface of the fresh leaf. 
THE LARVA OF DRYOPTERIS ROSEA. 
In order to compare this caterpillar with that of Drepana arcu- 
ata , as well as to show in what different ways the larvae of two al- 
lied genera may be ornamented and colored to secure the same ends, 
I have prepared the following description from a blown larva kindly 
loaned me by Professor Riley. The caterpillar has been briefty de- 
scribed by Mr. Grote (Can. Ent., xix, 50), who found the full-grown 
larva “in the beginning of July, feeding on Viburnum acerifolium.” 
He described the caterpillar from life and stated that it is “olivaceous 
brown, pale dorsally ; dorsal line single, dark ; a triangular dark 
patch on each side of the body commencing on segment four (I do 
not count the head) and bordered above the abdominal feet with 
pinkish.” “In resting, the terminal segment is slightly elevated.” 
Grote adds : “ Pupation in a light, close web of pale-brown silk, 
between the leaves (July 6-8). Coloration protectional, conceal- 
ing the larva as it rests on the stem of the leaf. The spotting of 
the ‘tail’ with pale is part of the protective coloration. After 
three weeks in the pupa the moth appears.” We may add that 
nearly thirty years ago we found this larva on the edge of a Vi- 
burnum leaf ; it was probably in next to the last stage and had a 
good deal of yellow about it, and was thus assimilated to the gen- 
eral color of the faded edge of such a leaf. Professor Riley’s 
specimen was collected at Washington, D. C., June 30, 1884. 
The full-grown larva.— Length 21 mm. ; and of the suranal ap- 
pendage 5 mm. The head is small, very narrow, not much over 
one-half as wide as the body across the middle, the vertex ending 
in two high conical lobes, each bearing a large, rounded, tubercu- 
lated knob ; seen from in front the head is squarish, while the en- 
tire surface of the head is densely covered with coarse, prominent 
piliferous warts. The clypeus is of unusual shape, not being as in 
Drepana, nearly triangular, but the apex is rounded, giving a 
tongue-shaped appearance to the upper portion, which is separated 
from the lower broader portion by a sudden contraction in width, 
which is not present in Drepana arcuata. 
The larva also differs greatly from that of D. arcuata in the 
lack of dorsal piliferous warts. On the middle of the back of the 
third thoracic segment is a large, fleshy, round, knob-like projec- 
tion, covered with minute piliferous warts. The ninth abdominal 
