320 Arachnida from the Transvaal and Nyasaland. 



first to the fourth ; femora with a weak line of spinules above ; 

 claws of first, second, and third armed with five to seven long 

 teeth in a single series, those of the fourth with only two 

 basal teeth and a few smaller ones. 



Palpus short, only just surpassing the apex of the femur of 

 the first leg when the two are extended, unarmed except for 

 one spine at the apex of the tarsus ; tibia half as long again 

 as the patella, more than twice as long as the tarsus, nearly 

 three times as long as broad, not so broad as high, its upper 

 edge strongly convex, thickly furnished with long hairs 

 below ; a shallow depression or notch on its inner side for 

 the reception of the tip of the palpal organ ; tarsus strongly 

 convex at the base, hooked at the apex; spine of palpal 

 organ acute at the tip, spatulate above the tip, with a short 

 spiral twist. 



Measurements in millimetres. — Total length of trunk 16, of 

 carapace 8^ width 7 ; length from fovea to anterior border 4' 7 ; 

 width of ocular tubercle 2 ; length of palpus ll*o ; lengtli of 

 first leg 30"5, second leg 27, third leg 22, fourth leg 31; 

 patella, tibia, and tarsus of palp 6*5 ; patella and tibia of first 

 leg 10*5, of fourtli 11 ; protarsus of fourth 7*8. 



A single male example from Pretoria (IF. L. Distant). 



Hie three African species of Acanthodon known to me and 

 represented only by male specimens may be recognized as 

 follows : — 



a. Tibia of palp ^\ith only a shallow external notch, 

 furnished below externally and internally with 

 long bristles ; protarsus of first leg concave at the 

 base on the inner side, in front of the concavity 



a low prominence tipped with spines ^^retorice, sp. n. 



h. Tibia of palp with a conspicuous external notch, 

 bounded behind by a spine-tipped prominence or 

 ridge ; no spine-tipped process on the base of the 

 protarsus of the first leg. 

 a}. Of large size (carap. nearly 12 mm. long) ; cara- 

 pace coarsely granular ; tibia of palp strongly 

 inflated, with a deep notch and a large spine- 

 tipped process on the outside ; protarsus of first 



leg distinctly curved Meadii, Cambr. 



6\ Of small size (carap. about 4*5 mm. long) ; cara- 

 pace much less coarsely granular ; tibia of palp 

 less inflated, with a shallower notch and a 

 smaller spine-tipped prominence ; protarsus of 

 first leg straight Thorellii, Cambr, 



A. Meadii, Cambr. (Proc. Zool. Soc. 1870, p. 152, pi. viii. 

 fig. 4), from East Africa, further differs from prelorice in 



