448 Records of the Indian Museum. [vol. XXII ^ 



about three quarters of the way to the end of the dorso-lateral 

 margin with an upwardly directed and forwardly curved spine, 

 which is bifid distally. The fang-groove is oblique and somewhat 

 curved. The ventral row of teeth consists of one lara;etootii at the 

 base of the fang, followed at a little distance by a row of about 

 five others, of which the anterior is the largest. In front of the 

 dorsal row there is usually a pair of minute denticles situated trans- 

 versely at the base of the fang. The dorsal row proper begins about 

 a third of the way down the joint with a very long tooth situated 

 somewhat high up on the dorsal surface and followed at a little 

 distance by a row of about five others, normally of small size, the 

 first of these being situated about opposite the last of the ventral 

 row. The fang is lightly geniculate. The palps of the male are 

 slender, with the patella about two-thirds as long as the tibia, 

 and the tibia and tarsus together about two-thirds as long as the 

 femur. 



Genus Orsinome, Thorell. 



The following Oriental £,pccies have been recorded : — 



0. arniata, Pocock, 1901, pp. 480, 481 (male only) from 



Shillong in Assam. 

 0. inarmorca, Pocock, 1901, pp. 479, 480, from Ootaca- 



mund in the Nilgiri Hills and Ponmudi in Travancore. 

 0. phrygiana, Simon, 1901 a, pp. 56, 57 (male only) from 



Bukit Besar, Jalor, Malay Peninsula. 

 0. vethi (van Hasselt) 1882, pp. 32, 33 (damaged male only) 



from Java. 



Little has yet been recorded of the habits of this genus. The 

 two species that are known to me, 0. marmorea and 0. listen, 

 both spin their webs among boulders in mountain streams and the 

 former at least drops into the water beneath when disturbed, 

 clinging to the first rock against which it is swept by the current, 

 an inch or two below the surface, till its alarm has subsided (see 

 Gravely, 1915, p. 537). 



A male and female are sometimes found together in one web 

 with their heads in contact. 



Orsinome marmorea, Pocock. 

 Fig. ya, b. 



0. maymorea, Pocock, igoi, pp. 4S0-481. 



Localities. — Kavalai, 1300-3000 ft., and ForesI: Tramway 

 29-30th mile, 1600 ft., in Cochin ; Talewadi near Castle Rock in 

 N. Kanara ; Coonoor, 5700-6000 ft., Nilgiri Hills ; and Pachmarhi, 

 3000 ft., in the Satpura Hills of the Central Provinces. 



Females of this species may be as much as 12 mm. long, with 

 much more massive and rotund abdomen than the males. 



The vulva of the female is a large smooth reddish brown chiti- 

 nous plate, roughly circular in outline though with a slight posterior 



