Species of Opisthophthalmus. 145 



(d) Grasmond (half-way between Steinkopf and Jackalswater) ; 



(e) Sables, Bushmanland (If. Schlechter). 



The specimens from these three localities are of interest as they 

 occur in the territory belonging to crassimamis and wahlbergi, and 

 appear here very much rarer than the two latter. There are no 

 adult males amongst them, but they agree in other respects with the 

 principal form with which I provisionally place them. Tarsus of 

 third leg always with one external spine below. 



B. Far. /3 (Southern Race}. Last segment of the sterna in the 

 $ with about 20 or more irregular transverse rows of granules, 

 the granules on this segment being much more numerous and closer 

 together. Tarsus of third leg generally with no external spine below. 

 Inhabits more southern territory. 



(/) 9 ad. 2 and 5 ad. $ , collected between Steinkopf and Springbok 

 (Max Schlechter): No. of pect. teeth in ? 13-17, in $ 17-20; 

 length of carapace in $ 15^-18! mm., in $ 16^-17 mm. ; ex- 

 ternal tarsal spine of third leg present in only 11 per cent, of 

 cases ; the mesial sternal granules in the $ mostly strongly 

 linear ; the granulation on the anterior half of the interocular area 

 and on the sides of the carapace very coarse and strong. 



(g) 10 ad. ? and 8 ad. $ from the Karniesberg (Max Schlechter) : 

 No. of pect. teeth in $ 13-18, in $ 18 (rarely 16)-22 ; length of 

 carapace in ? 14^-17 mm., in $ 15^-17-J mm. ; external tarsal spine 

 of third leg present in 31 per cent, of cases ; mesial sternal granules 

 in the $ mostly linear ; granulation of the carapace generally 

 moderately strong. 



(h) 2 ad. ? andl ad. 3 from Garies (alt. 830ft., Max Schlechter) : 

 No. of pect. teeth in ? 13-17, in $ 19-21 ; length of carapace in ? 

 Yl\ mm., in $ 15^- mm. ; no external spine below on tarsus of third 

 leg ; mesial sternal granules in $ linear-oval, finer than in the 

 previous specimens, the granulation thus approaching that of 0. 

 leipoldti ; granulation of carapace moderately strong. 



From the above it appears that 0. ijranifrons is made up of two 

 races, distinguishable chiefly by the granulation of the last segment 

 of the abdominal sterna in the male, but also, although with much 

 less certainty, by the limits within which the length of the cai-apace 

 and the number of the pectinal teeth vary, and by the presence or 

 absence of the external inferior spine on the tarsi of the third pair of 

 legs. These differences alone are, however, not of specific import- 

 ance. Pocock's typical female, as well as his male specimen, 

 evidently both belong to the northern or principal form, his young 

 specimen, however, to the southern race. As the pectines were 



