ACAJfTHODON. 161 



Genus ACANTHODON, Guerin. 



Acanthodon, Guerin, Rev. Zool. 1838, p. 10; Simon, Hist. Nat. 



Araign. i. p. 91, 1892. 

 Idiops of recent authors up to 1892 (not of Perty). 



Carapace polished, scantily hairy ; fovea large, strongly pro- 

 curved ; head high ; anterior lateral eyes situated in the middle of 

 the anterior border of the carapace ; the remaining eyes forming a 

 group far behind the anterior edge of the carapace. Mandible 

 powerful ; rastellum consisting of stout spines borne upon a distinct 

 prominence. Sternum with posterior sigilla obsolete. Legs in 

 female short and stout, claws armed with 1 or 2 large basal teeth ; 

 distal segments of legs not scopulate, those of the anterior pairs 

 and of palpi thickly spined laterally ; tibia of 3rd not depressed 

 above at base. Apical segment of posterior spinning-mamillce 

 short. 



c? . Carapace lower, rugose ; legs long and slender. 



Type, A, petiti, Guerin. 



Distribution. S. America ; Tropical Africa ; Syria, Arabia , 

 India and Burma. 



Synopsis of Indian Species. 

 Females. 



a. Coxa of 4th leg without band of spinules ; tibia 



of 3rd longer than wide. 



a 1 . Ocular tubercle elevated in front A. crassus, p. 161. 



b l . Ocular tubercle not elevated in front A. opifex, p. 162. 



b. Coxa of 4th leg with band of spinules below ; 



tibia of 3rd as wide as long. 



a 2 . Eyes of posterior line subequally spaced . . A. fortis, p. 163. 

 b 2 . Eyes of posterior line unequally spaced .... A. constructor, 



[p. 163. 



Males. 



a. Tibia of 1st leg armed with a stout, pointed, 



and bent spur, and a tubercle behind it .... A. constructor, 

 b Tibia of 1st leg armed with a low prominence [p. 163. 



tipped with a long spine, and a small tubercle 

 above it. 



a'. 4th leg only a little longer than the 1st; 

 protarsus of 1st strongly concave in its 



basal half on inner side A.fossor, p. 164. 



b'. 4th leg considerably longer than 1st ; pro- 

 tarsus of 1st weakly concave in its basal 

 half on inner side A. designalus, p. 164. 



131. Acanthodon crassus, Simon, Ann. Mus. Genova, xx, p. 357, 

 1884 (Idiops) : colletti, O. P. Cambr. P. Z. S. 1889, p. 37, pi. ii, 



fig. 2 (Idiops). 



5 . Colour : carapace, etc. mahogany-red, legs paler ; abdomen 



