1890.] 
89 
[Packard. 
tenant hair, which is generally spine-like, but besides these appen- 
dages there are sometimes more or less flattened, lamellate setae 
which are curious and worthy of notice. In Parorgyia parallela be- 
sides the unguis and the spine-like tenant hair, there is a lamellate 
flattened hair. Fig. 10 represents the end of a thoracic leg of Loch - 
rriceus manteo. Besides the unguis and tenant hair at tne end there 
are two singular, thin, flattened, oval leaf like setae arising near 
the middle of the joint. The use of the claw and tenant hair as 
grappling organs is quite apparent, but the function of the singular 
lamellate hairs is a matter of conjecture. 
II. THE PRESENCE OF DORSAL EYERSILLE GLANDS IN PARORGYIA PAR- 
ALLELA AND LARI A ROSSII. 
Mr. E. B. Poulton 1 has called attention to the presence of an 
eversible gland in the median dorsal line of the seventh abdominal 
segment of the European Dasychira pudibunda. This led me to 
ascertain whether the well-known coral-red warts on the larva of 
our common Orgyia leucostigma were of the same nature, and 
in a note in the American Naturalist (Sept. 1886, 814) I gave the 
following account of their appearance and behavior. It was re- 
marked that “the two coral-red tubercles on the back of the sixth 
and seventh abdominal segments of that caterpillar are on irritation 
of the animal plainly eversible ; when the caterpillar is at rest, they 
are often one-half as short as when disturbed, and the tip is flat- 
tened or deeply hollowed ; on irritation the end is everted and be- 
comes rounded and conical ; over the upper half are scattered three 
or four short, fine setae. While walking, the tubercles are only 
partly exserted, and the edges are usually in motion, slightly evert- 
ing and retracting. 
Dr. Riley 2 states that he had observed two coral-red eversible 
glands on the back of Parorgyia clintonii and P. leucophcea and 
that they also occur in the Californian Orgyia gulosa and vetusta. 
He has also noticed quite a strong odor from those of Orgyia, and 
that “a fine spray of liquid is sometimes thrown from them.’ , 
In my alcoholic specimens of Parorgyia parallela I have detected 
these glands, one each on the sixth and seventh abdominal seg- 
Pransaetions Eat. Soc. London, 1886, 159, 18S7, 299-301. These glands had previously 
been noticed by C. Schwarz, in 1791, Joi’dens in 1801, and by Klemensiewicz in 1882. 
(Verh. bot. zool. Gesells., Wien. See Dimmock in Psyche III, 387-401.) 
Proceedings Ent. Soc. Washington. 
