168 Annals of tlic South African Museum. 



(/) De Neus, Great Bushmanland, Kenhardt Div. (M. Sc/tlccJitcr). 



Notwithstanding the absence of the forked groove and of the coarse 

 granulation on the carapace, this species is nearer to 0. granifrons 

 than to any other. The palps, the pectines, the armature of the 

 terminal tarsi, and the granulation of the cauda and sterna are very 

 similar in both species. 0. (frani/rons was also found, though in 

 much fewer numbers, in some of the localities where 0. crass/inanus 

 occurs (at Grasmond and Jackals water). 



OPISTHOPHTHALMUS LOXGICAUDA, n. sp. 



Adult Males (recently killed, in spirits). 



Colour. Carapace and cauda ochraceous ; vesicle, legs, and palps 

 pale-yellow ; fingers, mandibles, and terga dark olive-green or black ; 

 sterna dark or pale. 



Carapace rather depressed, slightly longer than broad, consider- 

 ably shorter than the first two caudal segments taken together ; 

 anterior margin truncated, not emarginate in the middle ; median 

 groove widened into a shallow depression in front of the eye-tubercle, 

 not forked anteriorly ; sides of the carapace, even at the posterior 

 angles, coarsely granular, especially along the borders of the inter- 

 ocular area ; interocular area for the greater part nearly smooth, 

 sparsely granular or smooth anteriorly ; length of carapace about 

 four and a half times the distance of median eyes from the hind 

 margin ; distance of these eyes from anterior edge 3-3A- times their 

 distance from hind edge. 



Terga densely granular, coarsely so at the sides, especially in the 

 last segment. 



Sterna coarsely, densely, and evenly granular over the whole sur- 

 face, the granules on the last segment larger than those on the 

 anterior ones and often conical ; no traces of keels. 



Cauda strong and very long, four and a half times as long as the 

 carapace ; upper surface nearly smooth, sparsely granular in segment 

 1 ; upper crests coarsely granular, the terminal tooth enlarged in 

 segments 2-4 ; upper lateral crests coarsely granular, terminating 

 posteriorly in the middle of fifth segment ; infero-lateral keels 

 coarsely granular ; infero-median keels obsolete in the anterior 

 segments, granular in the posterior ones ; under surface of cauda 

 densely and coarsely granular in segments 1 and 2, sparsely granular 

 between the keels in segments 3-5 ; sides of the cauda coarsely 

 granular between the keels in segments 1 and 2, sparsely so or 

 nearly smooth in segments 3-5 ; vesicular segment much shorter 



