18 Annals of the South African Museum. 



This species is remarkable for its dark coloration and the absence 

 of keels from, and smoothness of, the under surface of the first four 

 caudal segments. It shows considerable affinity to 0. granicauda. 

 The structure of the cephalothorax resembles that of granicauda 

 and granifrons. 



OPISTHOPHTHALMUS LEIPOLDTI, n. sp. 

 Plate III., fig. 5. 



Male (recently killed, in alcoJiol}. 



Colour of carapace and abdomen brown, the last segment 

 yellowish ; the interocular area of carapace, the palps, legs, and 

 tail pale ochraceous ; the carapace along the sides of the inter- 

 ocular area blackened ; the crests of the palps, the fingers, and the 

 mandibles black or blackish brown. 



Carapace longer than wide, as long as the first and second caudal 

 segment ; it's interocular area coarsely granular in the anterior half, 

 nearly smooth on the convexities behind ; sides of the carapace 

 granular, coarsely so along the borders of the interocular area ; 

 length of carapace 3i 3f times the distance of median eyes from 

 posterior edge ; median groove distinctly forked in front. 



Tcrfja as in 0. granicauda. 



Sterna. Segments 1-3 (or 2-3) weakly granular along posterior 

 border and in the middle, the first sometimes quite smooth; segment 

 4 densely granular in the middle and posteriorly, very finely so 

 laterally ; segment 5 (and the first caudal segment below r ) keelless, 

 very densely and evenly covered with low, oval granules, which are 

 somewhat less coarse but denser and more numerous than in the 

 male of granifrons and capensis ; spiracles with parallel edges. 



Cauda less robust than in granifrons ; the upper surface in seg- 

 ment 1 coarsely granular, in the following segments with a few 

 scattered granules or nearly smooth ; upper crests granular, the ter- 

 minal tooth enlarged and spiniform in segments 2-4 ; upper lateral 

 crests well developed, granular, in the fifth segment weak and present 

 only on the anterior half ; infero-lateral crests practically obsolete in 

 segment 1, the median crests completely absent in the same segment, 

 both these crests weakly granular in segment 2, more strongly so in 

 segments 3 and 4, strongly granular in segment 5 ; sides and under 

 surface of segments 2-5 with scattered granules, the under surface 

 of segment 2 more densely granular between the keels ; vesicle 

 smooth ; fifth caudal segment more than three times as long as 

 broad. 



Palps, All the 'crests of the humerus together with its upper- 



