A Survey of the Scorpion Fauna of South Africa. 
173 
according to Kraepelin (13), who has examined the type, it is a Natal species. 
It is the species I have previously referred to as rugulosus Voc. (19). Peters 
described it as a variety of asper ; his original description is inaccessible to 
me. It is known to me from the following localities in Zululand : Mseleni 
(Natal Museum), Makowe (Durban Museum), East Zululand (Natal 
Museum) ; also from Hectorspruit (Transvaal Museum), Newington (J. P. 
Fenoulhet), and from Serowe (S. Blackbeard). The Serowe material, con- 
sisting of two immature specimens, may possibly represent a distinct variety, 
as the fourth tarsi have 3*2 (or 4*2) spines inferiorly, in addition to the 
bristles at the angles. 
0. LAEviPEs Pocock (PI. XXVIII, figs. 80 and 81) Ann. Mag. Nat. Hist., 6, 
12, p. 319, 1893. 
Distribution : The type came from the Sheba Mine, Transvaal ; the 
Transvaal Museum has this species from Barberton, Komati Eiver, and 
Louw's Creek. The females have only 7.7 or 7.8 pectinal teeth and the lobes 
on the fingers are more basally situated and not nearly so prominent as in 
males. 
Key to the South African Species of the Genus Opisthacanthus. 
(1) Pectinal teeth 8-10 in the male (7 or more in female) ; fourth 
caudal segment with a distinct dorsal keel, which is usually 
definitely toothed but sometimes only weakly so . .2. 
Pectinal teeth 5-7 (usually 6) ; fourth caudal segment without 
a definite keel dorsally and the superior margin not distinctly 
toothed 3. 
(2) Supero-anterior crest of humerus not prominent; upper surfaces 
of palp with isolated rugosities or granules ; carapace rather 
coarsely granular throughout ; a pair of bristles at the inferior 
distal angles of the fourth tarsi, and in addition with 3.3 
(occasionally 3.2 or 4.2) spines inferiorly ; external surfaces of 
fourth femora granulated and punctate . . . .0. chry^opus Ptrs, 
Supero-anterior crest of humerus strong and prominent ; hand 
almost smooth above ; carapace not granulated on the anterior 
lobes ; external surface of fourth femur punctate but not 
granulated ; a pair of spines at the inferior distal angles of 
the fourth tarsi and in addition 3.2 spines inferiorly . . O. laevipes Poo. 
(3) Vesicle with only 1 well-developed row (or none) of granules 
on each side inferiorly, more or less distinct indications of a 
second row being sometimes present . . . . .4. 
Vesicle with 2 well- developed rows of granules on each side 
inferiorly ; external surfaces of femora and patellae of fourth 
leg granulated ; tarsus IV with a bristle at the distal angle 
inferiorly, and in addition 4.3 spines on the lower surface ; 
carapace granulated throughout ...... O. capemis Thor.. 
