Opistliophtlialmus in the British Museum. 245 



posteriorly ; lateral surface granular, infero-lateral keels weak, 

 weakly granular ; inferior median keels obsolete on the first 

 and almost so on the second, very weak on the third and 

 fourth ; lower surface of the first thickly granular like the 

 last abdominal sternite, the second also similarly though less 

 strongly granular below, the third and fourth still more 

 weakly ; the median keel on the fifth formed of a single row 

 of denticles. 



Chela*. — Humerus with strong and coarsely granular crests, 

 its upper surface rather smooth, with only a few small 

 granules behind ; upper crest on the brachium crenulate ; 

 hand furnished with a very strong, complete, and continuous 

 finger-keel, vertical area external to this granular, the hori- 

 zontal area internal to it nearly flat, flatter than in 0. capensis, 

 only finely granular, with scarcely a trace of supernumerary 

 crests ; the inner edge denticulate distally, thickly furnished 

 with long setas; hand-back equal to the width of the hand 

 from the inner edge to the finger-keel, and half the length of 

 the movable digit ; lower surface of hand nearly smooth, only 

 very finely granular. 



Femora of legs finely granular externally; distal protarsal 

 segment of first, second, and third pairs spiny on the exter- 

 nal edge; lower surface of tarsi of third and fourth with two 

 external spines in addition to the four on the external tarsal 

 lobe ; lobes longer than superior process. 



Pec tines with proximal angle of the shaft rectangular, 17 to 

 18 teeth. 



Measurements in millimetres. — Total length 94; length of 

 carapace 12, width 12; distance of eyes from anterior border 

 8 ; length of tail 54 ; length of hand-back 7'3, of movable 

 digit 15; width of hand 8"5. 



Log. !S. Africa (Dr. Quain). A couple of male examples. 



According to Kraepelin's table this species, with its 

 granular sterna and undivided cephalic sulcus, falls into the 

 same category as glabrifrons, pugnax, and prasdo. The 

 granulation of the upper surface of the hand is rather finer 

 than in male specimens of glabrifrons from Mashunaland and 

 Nyasa, and the finger-keel is much stronger, while the inner 

 keel is even less well developed. The carapace, too, is 

 longer in glabrifrons, excelling the first and second caudal 

 segments in length and also the fifth, as well as being longer 

 than the upper surface of the hand. Moreover, the first and 

 second abdominal sterna in glabrifrons are smooth. 



Fiom pugnaXj breviceps differs in the finer granulation of 

 the hand and the obsoleteness of the internal keels, in the 



