Packard.] 
488 
[Feb. 19, 
master with its well developed excurved hooks, but I noticed upon 
endeavoring to remove the alcoholic specimens from the cocoon that 
it strongly adhered to and was entangled in the threads of the co- 
coons by a very remarkable double armature of hooks on the ex- 
tremity of the head, which were quite novel and interesting to me. 
These hooks in addition to the ordinary cremaster, are evidently a 
special adaptation enabling the insect to rest securely within its co- 
coon and not be shaken or blown out of the leaf while on the tree. 
The pupa. — Length, 11mm. Body rather thick, of the normal 
shape, the wings and hind legs reaching near the hinder edge of the 
fourth abdominal segment. The»surface in general is rather coarsely 
pitted, and the hinder edge of the fourth to sixth abdominal seg- 
ments is dark, with the surface finely shagreened. A pair of minute 
sharp warts on the under side of the fifth and sixth abdominal seg- 
ments, those on the fifth being the largest. The cremaster is large 
with the surface rough with radiating ridges and rugosities. The 
end forms an elongated smooth projection, rounded and polished at 
the tip just before which is a semicircle of six recurved hooks. 
On the head is a pair of stout, short tubercles, separated by a deep 
narrow chasm, and ending each in a stout upcurved conical hook. 
The length of the different stages approximately in days is as 
follows : egg stage 7-8 days ; larva : stage I, 2-3 days ; stage II, 
7 days ; stage III, 4-5 days ; stage IY, 8-9 days ; stage Y, to date 
preparatory to preparation, 10 days ; prepupal stage, 4-5 days; 
pupal stage not noted, as date of emergence was not observed. 
The second brood of larvae appears in September, as Mr. J. Bridg- 
ham found on the white birch a larva ready to pupate September 
20, and those reared by Mr. Beutenmuller were of the second or 
September brood. Of the two broods of moths in New England, 
the first seems to appear the first week in June, and the second at 
the end of July. 
RECAPITULATION OF THE SALIENT FEATURES IN THE ONTOGENY OF 
DREPANA ARCUATA. 
A. Congenital adaptational characters of the larva. 
1. Anal legs obsolete; suranal plate already ending in an ele- 
vated rod-like spine in stage I. 
2. Glandular hairs (split at the end) present only in stage I. 
3. Piliferous warts well developed, but of uniform size on all the 
segments, in stage I. 
