206 
ANNALS NEW YORK ACADEMY OF SCIENCES 
ZOROPSID M. 
1. Acanthocteims Marshii F. Cambridge, Ann. Mag. Nat. Hist., 6 th ser., 
vol. xix, p. 103. 1897. 
Plate XXI, Fig. 1 . 
One specimen of this large spider was caught by Prof. W. J. Moenkhaus 
at P 090 Grande, Brazil, in 1897. It is a mature female, and the measure¬ 
ments show that there can be no doubt as to its identity. There are, how¬ 
ever, two points in which this specimen differs from the type, both margins 
of the chelae are armed with three teeth and the epigynum although similar 
to that figured by F. Cambridge shows difference in structure, as may be 
seen by comparing the type with Plate XXI, fig. 1 . I do not, however, 
consider these differences sufficient to constitute a new species. It is true 
that the number of teeth on the margins of the chelae is a remarkably con¬ 
stant character and has been used by Cambridge and Dahl for the separation 
of species, but I have seen exceptions to it in other families of spiders. On 
the other hand, the shape of the epigynum changes after copulation and still 
more after the eggs are laid. 
Total length, 16.5; cephalothorax, 7.5 long, 6 broad between second and third 
legs; legs in order 4123; first coxa the longest. 
Legs 
Femur 
Pat. + Tib. 
Metatar. 
Tarsus 
Total 
I 
8.5 
13.0 
8.0 
2.5 
32.0 
II 
7.5 
11.0 
7.0 
2.0 
27.5 
III 
6.5 
8.5 
6.5 
2.0 
23.5 
IV 
8.5 
11.0 
10.3 
3.0 
32.5 
Spines on 
legs: First leg. 
— Femur, EPS 
, 12 spines in 
3 rows as 
follows: 4 in the 
, 3 in the 
meso and 5 in 
the retro row; 
tibia, HYS, 8 pairs of long spines, PRS 
and RES, with an apparently variable number of small spines; metatarsus, HYS, 
4 pairs of long spines, PRS, 1 proximal spine, RES, 1 proximal spine. Second leg .— 
Same as first. Third leg. — Femur same as first; tibia, HYS, 3 pairs, PRS, 2 spines, 
RES, 2 spines, EPS, 1 row of 3 spines; metatarsus, EPS, 1 spine, HYS, 5 pairs, PRS, 
4 spines, RES, 4 spines. Fourth leg. — Same as third; the only difference is in the 
number of spines in HYS of the metatarsus, there being four pairs instead of five. 
Patellse of all four pairs of legs have one PRS and one RES spine. 
Color in Alcohol: Mostly light brown with dark brown mandibles; on each 
side of cephalothorax and covering about one fifth of its entire width, a darker sub¬ 
marginal band; abdomen somewhat grayer, with three pairs of indistinct crosslines 
on back; lip considerably darker than sternum, nearly as dark as mandibles, but its 
tip yellow; along front edge of lip a row of dark bristles each sitting in a nearly 
black cupula; cephalothorax covered with short black and white hair; face with 
long black bristles and short white hair; sternum longer than broad, sparsely cov- 
