Oie Genus Latrodectus, Wahh. 39 



luinute acanthoid spines, densely on the 

 sides, more sparsely above, variable iu 

 length, but without longer and stouter 



spines paUidus, O. P. Cambr, 



ii. Abdomen furnished also with longer spines. 



a. The additional spines short, straight, and 



very stout JiystrLv, E. Simon, 



b. The additional spines longer and curved, 



usually bluntly pointed. 

 a}. The additional spines longer, curved 

 in every direction. Abdomen with 



red spots or entirely black tredecim-guttatus, Rossi. 



J\ The additional spines shorter, curved 

 mainly in the same direction. The 

 bands on abdomen never broken up 

 into spots nor (so far as one may 

 judge from material at hand) ever 

 entirely black, 

 a^. Dorsal apical red band on abdomen 

 clothed with both acanthoid 



spines and longer spines Ilassellii, Thor. 



b'\ Dorsal band without acanthoid 

 spines, bristles only. 

 o^. Bristles on dorsal band at least 



their own length apart var. indicus, Simon. 



6\ Bristles on dorsal band less than 



half their own length apart .... var. from Loyalty Is. 

 B. Integument of abdomen entirely devoid of 

 acanthoid spines, clothed only with line 

 silky hairs (or, in Meyiavodi, bristles). 

 a^. Central anterior eyes not larger than the 

 lateral anteriors. 



1. Bristles on abdomen of two different 



lengths. Abdomen with three lateral 



spots on each side devoid of hair .... Menavodi, Vinson. 



2. Bristles (or hairs) on abdomen of the 



same length. No lateral spots on 

 abdomen. 



fl*. Size larger mactans, Fabricius. 



b*. Size smaller. 



la. Legs much more slender. Femur 



iv. eight times its width geoijraphicus, Ilasselt. 



2a. Legs much stouter. Femur iv. 



five to six times its width katijpo, Powell. 



&*. Central anterior eyes larger than the 



lateral anteriors r/cometriats, C. L. Koch. 



Since my former paper was read I have also received 

 Dr. Dahl's publication on the members of this genus*. Whether 

 the characters deduced from the differences in the hairs of the 

 patella and tibia will bear the weight of importance laid upon 

 them can only be judged by a comparative examination of a 



* ' Sitzungs-Bericht der Gesellschaft naturforschender Freuude zu 

 Berlin,' p. 40 (Feb. 18, 1902): " Uebersicht der Za/zw/ccfMS-Arteu," by 

 Friedr. Dahl. 



