

No. 428.] DIEMYCTYLUS VIRIDESCENS. 649 
glands so characteristic of the adult males (Fig. 11); sometimes 
one or two tubules appear to have secretion in the lumens, and 
some have openings into 
the pits. 
To recapitulate: The pits 
in the adult males are almost 
invariably well marked, while 
those in the females, when 
they occur, are rather diffi- 
cult to detect ; and then, too, 
the gland tubules in the male Fe. o. — Section of a tubule from a red male Diemyc- 
are very ninebrous (Fig. 2). = of nearly adult size. 7, lumen. x 260. 
Adult males taken at other times than the breeding season, 
as a usual thing, show the gland tubules in a resting state; 
the lumens of the glands commonly have the cells almost touch- 
ing each other at the center, but males 
taken when breeding show these gland 
lumens filled with secretion and the cells 
appear as a low epithelium. 
Se It may be that these glands which are 
bame Siopa emi developed so extensively in the male, and 
Siei ooi T5! placed in a position which favors them, 
epe Tre with secre- are for the purpose of attracting the 
female by means of some secretion. 
Although, as already spoken of, similar mating habits have 
in general been described, they are not exactly the same as in 
D. viridescens, nor have similar glands or pits been described 
for other forms. Ritter, in an 
interesting paper on Diemyctylus 
forosus, describes no such struc- 
tures, nor was I able to detect 
any trace of such pits or glands 
in several specimens examined ; 
and, in fact, as already stated, 
the mating habits are entirely Fc 11-— Section of a pit from an adult female 
dissimilar in the two species. earns Me rnn E cio dunt 




