12 Annals of the South African Museum. 



of the terga and sterna and in the armature of the tarsi these 

 two species show considerable affinity to one another. The main 

 difference between them lies in the granulation of the carapace, 

 which is never provided with very coarse granules in 0. macer ', in 

 the latter, also, the upper surface of the hand in the male is 

 distinctly convex, in the distal part not concave, and furnished with 

 stronger secondary keels. In 0. macer the last segment of the 

 sterna is smooth, or granular only at the sides. 



Of 0. cliaperi Simon, only the male is known, and is referred by 

 Kraepelin to 0. 2^'Hosus (the male of 0. capensis), but it is a very 

 distinct species. The legs in cliaperi are yellow and the humerus 

 and brachium are blacker than in fossor, but for the rest the colora- 

 tion is identical. The hands are formed as in those specimens of 

 fossor which have the inner part of the upper surface nearly smooth, 

 and differ only in the absence of the secondary keels. The tail in 

 cliaperi differs in having the inferior median keels practically obsolete 

 in segments 1 and 2, the under surfaces of which are densely 

 granular. The 2-4 segments of the sterna are finely granular and 

 rugose and the last segment is densely granular with (in my speci- 

 men) traces of lateral keels. There is no trace of a fork of the 

 median groove in front. In all other respects the two species are 

 alike. 



0. intermedius, Kraepelin, which I have not seen, evidently also 

 belongs to this group. It differs from fossor by the legs being 

 coloured yellow and by not possessing secondary keels on the inner 

 part of the upper surface of hands, but appears to resemble it in 

 every other respect. 



OPISTHOPHTHALMUS SCHLECHTERI, n. sp. 

 Male (recently killed, in alcohol). 



Colour pale-yellow ; the vicinity of the eyes, a narrow strip on 

 each side of the interocular area of carapace, five lines on the 

 upper surface of hands, the mandibles, the anterior region of the 

 segments of the terga and the under surface of the five caudal 

 segments infuscate, the infuscate part with 3-1 longitudinal pale 

 lines in the anterior caudal segments. 



Carapace much longer than broad ; its interocular area shiny and 

 nearly smooth, convex in the middle on each side of the median 

 groove ; anterior edge not emarginate in the middle ; sides of the 

 carapace finely granulated, the granules along the borders of the 

 interocular area somewhat coarser than on the rest of the surface ; 

 median groove bordered by a row of granules on each side, distinctly 



