PETRUNKEVITCH, AMERICAN SPIDERS 
213 
the abdomen, it is only because Eugene Simon has incorrectly described, 
under the name M. horrida Tacz., a spider which belongs in all probability 
to a new species. I have three specimens of Micrathena horrida in my col¬ 
lection. One is a mature female from Sao Paulo, Brazil, collected by Prof. 
W. J. Moenkhaus; the two others are immature females which I collected 
in the Castleton Botanical Gardens, Jamaica. W. I. All three specimens 
agree in every detail with the description of Taczanovsky. The following 
measurements are from the Brazilian female. 
Cephalothorax, 2.5 long, 1.7 broad; abdomen from petiolus to anus, 3.0; ster¬ 
num, 1.2 long, 0.7 broad; clypeus, 0.172; diameter of eyes: AM, 0.105, AL, 0.083, 
PM, 0.123, PL, 0.083; distance between inside edges of AM, 0.090, of PM, 0.120 
of AL and PL, 0.030; distance between outside edge of PM and apex of angle formed 
by side eyes on each side of head, 0.435; quadrangulus as long as broad, each side 
measuring 0.345; legs in order 4123. 
Legs 
Femur 
Pat. + Tib. 
Meta tar. 
Tarsus 
Total 
I 
1.4 
1.6 
0.8 
0.6 
4.4 
II 
1.2 
1.4 
0.7 
0.55 
3.85 
III 
1.05 
0.95 
0.45 
0.45 
2.90 
IV 
1.7 
1.6 
0.9 
0.6 
4.8 
All femora with a row of tactile organs on HYS; femora of first pair thickened; no 
spines on legs. 
11. Micrathena Simoni {nomen novum ). 
= M. horrida Simon, Hist. Nat. Araign, vol. i, pf 850, fig. 898. 1895. 
= nec Micrathena horrida Taczanovsky. 
The number of tubercles or spines on abdomen in horrida is 16, as cor¬ 
rectly described by Taczanovsky. In Micrathena Simoni the number is 
considerably greater, and the abdomen forms posteriorly a tail which is 
lacking in horrida. 
12. Micrathena oblonga Taczanovsky (sub Acrosoma), Hor. Soc. Ent. 
Ross., vol. ix, p. 15, plate vi, fig. 26. 1872. 
Plate XXI, Figs. 12, 13. 
Cephalothorax, 4.2 long, 3.6 broad; sternum longer than broad (1.6 by 1.4); 
abdomen (measured on back from anterior edge to base of spines), 9.0 long; venter 
from petiolus to anus, 4.0; abdomen broad in middle, 5.0; clypeus, 0.24; diameter 
of eyes: AM, 0.210, AL, 0.150, PM, 0.195, PM, 0.135; distance between inside edges 
of AM, 0.135, of PM, 0.225, of AL and PL, 0.060; quadrangulus a little broader than 
long (0.555 broad, 0.525 long); distance between outside edge of PM and apex of 
angle formed by side eyes on each side of head, 0.825; legs in order 4123. 
