Dec., 1905.] 
Chelanops oblongus. 
415 
the fly’s leg was stiffened by a Chelifer cancroides (the book 
scorpion), which held fast for fifty-six hours, or until it was 
drowned in a drop of milk. Nor did the microscope show any 
evidence of injury to the fly’s leg. It occurs to me, however, 
that C. cancroides is one of the smaller species and consequently 
was not able to injure the fly’s leg as an individual of a larger 
species could have done. 
Cannibalism. — I observed several times, while collecting 
specimens, that large individuals were holding smaller ones in 
their chelae. I also observed the same thing upon some spec- 
imens kept in the jars (see C.\ptivity). Then, again, the speci- 
mens in the jars were continually on the decrease. From these 
several observations I am led to believe that Chelanops oblongus 
and other pseudoscorpions are cannibalistic. On the other 
hand, the immature of C. oblongus and other pseudoscorpions 
build small nests in which they live (or rather become torpid) 
during their moulting periods and in which they remain until 
their cuticle has hardened (see Breeding). This evidently 
indicates danger from enemies and probably from their own 
kin. I believe rather more from their own kin than from other 
enemies, since the places where pseudoscorpions live are small 
and the}'’ could easily crawl into some crevice where a larger 
enemy could not reach them. I furthermore found but few 
insects and other animals under the bark of sufficient size to 
be of much danger. These consideraitons strengthen my 
belief in the probability of cannibalism. I know of no writer 
who has made similar observations. 
Captivity. — In the three jars used for confining live speci- 
mens I kept from thirty to forty for nearly ten months. I 
can perhaps best give the histor}' of these by quoting the brief 
notes verbatim. 
Jar A. Sept. 3d. — All seem contented. Found one speci- 
men carrying a smaller one in his jaws. Is this ceuinibalism? 
Found one with a small bunch of yellow eggs. 
Sept. 30th. — I find fewer specimens, but all appear happv. 
There are none with eggs. There is a plenty of other little 
insects and mites in all the jars; also some small earthworms. 
Oct. 21st. — There are now only five specimens and none 
with eggs. 
Jar B. Sept. 4th. — This jar had three specimens with 
bunches of yellow eggs, and other specimens with and without 
small eggs. I can find nothing of those with eggs today. Found 
small one building a casting nest. No evidence of' eggs on 
any, but I had no lens with which to examine them. Bunches 
of eggs may be very small at first, quite colorless and difficult 
to see without a lens or without turning the animals over. 
