I92T.] 



F. H. Gravely : Indian Spiders. 



437 



invariably) spins its web on either side of a twig, whicli thus 

 comes to extend across one diameter of it, and uses the part of the 

 twig that crosses the centre of the web as its resting place. 



It differs from all other oriental species of the genus in hav- 

 ing the anterior median eyes much smaller and closer together 

 than the posterior medians ; and in the female the chelicerae do 

 not become very prominent even in adult specimens. The pos- 

 terior lateral ej'es are very prominent, and the anterior laterals 

 very small. In the female the dorsal margin of the fang-groove 

 bears a row of about eight teeth in descending order of magni- 

 tude, of which the first is situated at the base of the fang, the 

 second is situated some distance behind it and at a greater dis- 

 tance from the ventral margin, the third somewhat further from 

 the second than the second is from the first, but nearer to the 

 ventral margin than is the second . the rest being somewhat close 



/■ 



Text fig. i. 



-Tetragiiatlia gracilis 9 , eyes from above. 



., ,, 2 , chelicera from above. 



-Tefi-agnafha mandibnlata 9 , eyes from above. 

 — Tetragnatlia mackenziei 9 , chelicera from above. 



., ,. 9. eyes from above. 



together. The ventral margin bears about six teeth, of which the 

 second is situated further from the first than from the third and 

 is commonly the largest. Above the first tooth there is usually 

 a smaller tooth, likewise situated at the base of the fang ; and 

 the fang itself usually bears a distinct tooth on the outer side 

 iust above the base. Either or both of these last mentioned two 

 teeth may, however, be absent ; and the former of them may be 

 larger than the first tooth of the ventral series, especially when 

 the tooth on the fang is absent. It is to this form that Thorell 

 has applied the name fronto. In view of the variability of these 

 teeth, however, I think that jronto should be merged in (gracilis. 

 The fang is somewhat short and thick, abruptly curved close to 

 the base, then lightly curved, not geniculate. 



The chelicerae of the male are much longer and slenderer 

 than are those of the female. The subapical spine is long and 



