164 CTENIZIDJS. 



135. Acanthodon fossor, sp. n. 



3 . Carapace smoother than in A. constructor, with posterior 

 median eyes more than three times their transverse diameter apart. 

 Tibial apophysis of 1st leg consisting of a low process bearing a 

 slender, distally pointed and bent spine, behind the process there 

 is a small tubercle ; protarsus with very few spines, the process 

 much shorter, tuberculiform. Palp with protarsus less inflated, 

 hollow, shallower, and bordered above by a thick cluster of spines ; 

 spine of palpal organ evenly arched, with an outward apical bend 

 and a slight subapical thickening, when curled back at rest the 

 concavity of the spine faces forward and the point forward and 

 outward. 



Measurements in mm. — Total length 12, carapace G, 1st leg 21, 

 4th leg 21. 



Loc. India : the Deccan. 



13G. Acanthodon designatus, Cambridge, Araneidea, Second Yarl-and 

 Exped. p. 3, pi. i, fig. 1, 1885 (Idiops). 



Judging from the description and figures, this species is most 

 nearly allied to A. fossor, but has the anterior legs much 

 shorter, the 1st pair being much shorter than the 4th and only 

 two and a half times the length of the carapace. Moreover, the 

 protarsus of the 1st leg is thicker and much less concave in 

 its basal half ; the tibial apophysis is directed upwards from its 

 base ; and the palpal organ rests with the convexity of the spine 

 looking forwards. Length of carapace about 6 mm. 



Loc. Murree (Stoliczka). 



Genus HELIGMOMERUS, Simon. 

 Heligmomerus, Simon, Hist. Nat. Araiyn. i, p. 90, 1892. 



Differs from the genus Acanthodon in having the upper side of 

 the tibia of the 3rd leg excavated and smooth in its basal half. 

 Type, II. taprobanicus, Simon. 

 Distribution. India, Ceylon ; Tropical Africa. 



Si/noj)sis of Indian Species. 



a. Only the internal (anterior) claw of 1st and 2nd 



legs armed with a bifid tooth II. taprobanicus, p. 1G4. 



b. All the claws aimed witli a bifid tooth .... II. prostans, p. 165. 



137. Heligmomerns taprobanicus, Simon, Hist. Nat. Araiyn. i, p. 91, 

 1892. 



Colour : carapace blackish ; abdomen violet-black, paler beneath ; 

 sternum, mouth-parts, and appendages olive-yellow. Anterior 



