40 
PSYCHE 
[April 
A FUMALE SPIDER WITH ONE .AIALE PAU’US. 
BY ,1. H. EMERTON, BOSTON, MASS. 
'Pins is a largo ,s])ecimen of /Oy/wi/.s aarcafiis Ein. collected with other s]>i(lcr.s 
hy Miss E. R. Rrvant at Long Island, Portland, 
i\Ie., Aug. 10, loot), without its })eculiarities 
being noticed at the time it was taken. The 
general a])|)caranee is that of an old female of 
large size with the abdomen small and shriv- 
elled as in a female that has laid eggs. The 
epigvnum is complete and .symmetrical as in a 
normal female. The cephalothorax and abdo- 
men are symmetrical and the third and fourth 
legs are alike ou both sides. The right |)alj)U.s 
is that of a female and the left that of a male 
with the palpal organ fully developed. The 
first and second legs of the left side are slightly 
longer than tho.se of the right .side. The left 
mandible is thicker than the right and the claw 
is slightly longer but the mandilile is not elon- 
gated nor narrowed at the tip as it is in the 
male. Asymmetry of any kind is rare in s])i- 
ders. I’rof. Wb iM. Wheeler has called my 
attention to a ca.se described by Kulczynski in 
one of the publications of the Cracow Academy 
of Sciences in 1SS5. This was an Erigmie funra 
Blk. which had the right side like the female 
and the left like the male. The epigynum was 
develo|)ed oidy on the right side and the asymmetry e.xtended to the form of the 
cephalothorax and abdomen and even the s])innerets. The legs however were 
symmetrical in length, the only difference being in tho.se of the first pair which had 
the right tarsus like the female and the left like the male. 
