242 Mr. R. I. Pocock on the Species of 



No. 3 (young ^ in alcoliol). — Tlie interoculnr area smoother 

 tlian in the other two, especially in its posterior half, where 

 it is not granular. 



Terga nearly smooth, only finely granular at the sides and 

 posteriorly. 



Sterna and tail as in the female. 



Palpi as in the female, but hand much narrower [cf. 

 measurements). 



Pectines as in the female, with 16-18 teeth. 



Genital operculum as in male, i. e. normal and completely 

 divided. 



Tarsi not furnished below with an anterior s]:)ine. 



Measurements in mUlimetrcs. — Total length 73 ; length of 

 carapace 11*2, width 9'8 ; distance of eyes from anterior 

 border 8 ; length of tail 36 ; width of hand 7 ; length of hand- 

 back 6, of movable digit 8"5. 



Log. Concordia Copper Mine, Ookiep, in Little Namaqua- 

 land(TF. //. Clark). 



I believe the three examples that I have described above 

 are referable to the same species, since they agree sufficiently 

 well to permit the supposition that their differential characters 

 are merely due to differences of age and sex. 



According to Prof. Kraepelin's recent revision of the 

 species of Opisihopltihabnus, this new form falls into the same 

 section as that containing capensis^ pilosus, and pictus. From 

 the latter, which is unknown to me, granifrons certainly 

 differs in colouring as well as in having the interocular area 

 of the carapace granular instead of smooth. From cnpensis 

 and pilosusj granifrons may be recognized by having the 

 interocular area more granular, the hands more granular, and 

 the inner half of the upper surface much more strongly con- 

 vex, the finger-keel weaker and strongly granular, and the 

 crest bounding the upperside of the hand-back and the one 

 on the upperside of the brachium also strongly granular 

 instead of smooth. Moreover, in the female of capensis the 

 proximal intermediate lamella of the pectines is not elon- 

 gated. kSome points connected with colour are also notice- 

 able. In caj^ensis the crests on the chelaj, especially those on 

 the humerus, are much more strongly blackened and the 

 maxillary processes of the first and second pairs of walking- 

 legs are wholly fuscous. 



0. granifrons also seems to be readily distinguishable from 

 the two forms characterized by Thorell and Simon respec- 

 tively as latro and Chaperi^ which Prof. Kraepelin assigns to 



