es of Opisthophthalmus. 169 



and broader than the fifth caudal segment, smooth ; fifth caudal 

 segment (measured along the side) somewhat longer than or equal 

 to the carapace. (In the male of 0. karrooensis the cauda is less 

 than four times the length of the carapace, and the fifth caudal seg- 

 ment is considerably shorter than the carapace, and at least not 

 longer than the vesicular segment.) 



Palps. Humerus shorter than the carapace (in 0. karrooensis it 

 is somewhat longer) ; all the crests of the humerus coarsely granular, 

 its upper surface very coarsely granular in the posterior part, nearly 

 smooth in the anterior part, anterior surface flat, with a few very 

 coarse and some small granules and with very strongly defined 

 upper and lower crests, under surface smooth. Upper crest of 

 brachium coarsely granular, upper surface more or less distinguish- 

 able and separated by a crest from posterior surface, the posterior 

 surface elevated crest-like along the middle with rows of coarse 

 granules. Hands pilose, very long and slender, the length of hand- 

 back much exceeding the breadth of hand ; inner part of upper 

 surface of hand flat, almost smooth, without traces of secondary 

 keels ; finger-keel strong, nearly smooth or weakly crenulated ; 

 inner edge of hand denticulate ; outer part of upper surface of hand 

 with a row of granules along the middle and another near the lower 

 edge, otherwise smooth ; the outer and inner parts of the upper. 

 surface of the hands are inclined almost at right angles to each other 

 (as in the male of 0. karrooensis'). 



Legs. Posterior femora minutely granular on anterior surface ; 

 lower edges of all the femora and the upper edges of the posterior 

 ones with a row of coarse granules ; tarsi of the last two pairs of legs 

 with 3-4 external and 5-7 internal spines below, in addition to the 4 

 (sometimes in last pair only 3) external and 5 internal spines on 

 the terminal lobes ; superior process much shorter than the lateral 

 lobes. 



Operculum transverse, much broader than long, completely cleft 

 longitudinally. 



Pectincs extending scarcely to the middle of the trochanters of the 

 fourth pair, and furnished with 18-21 teeth ; scape rounded at the 

 base behind and free of teeth for from ^ ^ of its length. 



Measurements in Millimetres. Total length 104; length of carapace 

 14f ; width of carapace 14 i ; distance of eyes from anterior margin 

 K}TT ; length of humerus 14 ; width of hand 8 ; length of hand-back 

 9, of movable finger 17-|, of tail 64^, of fifth caudal segment (measured 

 along the sides) 15, of vesicular segment 11-f ; width of first caudal 

 segment 5-|, of fifth caudal segment 4, of vesicle 5. 



