134 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
is also a pair on joints 2 and 3. The peculiar black patches on the 
thorax are absent. 
Diphtera ludifica, Linn. 
Warts small, iv and vi indistinguishable on abdomen; a dense 
coating of secondary hairs. Joint 12 is humped dorsally, bearing i 
and ii, and joint 3 is humped subdorsally, bearing the two upper warts. 
The coloration, as well as the tine soft hairs, produces a close resem¬ 
blance to some Lasiocampidae. 
Apatela americana, Harr. 
Warts reduced, the primary hairs indistinguishable from the 
abundant stiff secondary ones. Consequently the larva is covered 
with a dense, uniform, hairy coat, its regularity scarcely disturbed by 
the wart areas which cannot all be distinguished with certainty from 
the groups formed by the secondary tubercles. Wart i on joints 5, 
7, and 12 bears a long slender pencil of black hairs. 
A. lepusculina , A. dactylina , A. vulpina , and the European A. 
leporina have the same characters, but the two latter lose the black 
pencils at the last molt. 
(Note. I provisionally exclude Bryophila and Diloba from the 
Apatelidae, at least until the young larva has been examined. The 
mature tubercles are simple as in the Noctuidae, and the presence of 
tubercles iib and iii on the thorax renders it probable that at no time 
in the life history are true warts present.) 
Family Arctiidae. 
A large number of species which I have examined show practically 
no variation from the well-known type. I have figured the abdominal 
warts in Annals of N. Y. academy (vol. 8, p. 198, fig. 5) and have 
described the thoracic ones in the Transactions of the same academy 
(vol. 14, p. 57), but it is more probable that the second thoracic wart 
is derived from iia, while iib disappears as in the Apatelidae. This 
is certainly the case in most species, and I think that my former 
statement to the effect that iia and iib were consolidated should be 
corrected. There are no secondary hairs, although the warts may 
bear various bunches and tufts of modified hairs. Only very rarely 
are the warts degenerate. I will give a few examples to illustrate 
the range. 
Tyria jacobaeae, Linn. 
Tubercles degenerate, single haired except vi which bears two hairs; 
