98 PECKHAM. [Vol. 3. 



one by the female alone. The following table will be useful 

 in distinguishing the species, so far as the males are concerned. 

 As to the females, they resemble each other so closely (except- 

 ing that patens has the legs 1243 instead of 1234), that they can 

 only be distinguished by the epigynes. 



KEY FOR MALES. 



1. Falces vertical or nearly vertical ; legs, 1234, . . 2 

 Falces horizontal or nearly horizontal ; legs, 1234 or 



1243, 3 



2. Falces vertical, parallel ; color of abdomen variable, 



sometimes dark, ...... robustus. 



Falces not quite vertical, diverging after the first third ; 



abdomen yellow, ...... patens. 



3. Legs, 1243, 4 



' Legs, 1234, 5 



4. Marked fringe of hairs on each side of tibia and meta- 



tarsus of the first leg, and similar but less marked 

 fringes on second ; no tooth on the fang of the 

 falx, ........ jemineus. 



Ver}'" slight fringe on metatarsus of the first leg ; a 

 distinct tooth on the fang of the falx, near its in- 

 sertion, ....... redudus. 



5. Abdomen with longitudinal black bands ; metatarsus 



of the first leg with a heavy fringe of hairs ; no 

 marked tooth at end of falx ; fang nearly straight, 



remotus. 



Abdomen yellow, sometimes with black dots ; meta- 

 tarsus of the first leg with a very slight fringe of 

 hairs ; falx with two teeth at the distal end ; fang 

 with a double curve, viridis. 



