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Transactions of the Uoyal Society of South Africa. 
h^^. Superior' process of tarsi as long as the Lateral lobes or 
nearly so. (a^^^-b^^.) 
a^'. Tarsi of last two pairs of legs with 0-1 external 
spines below ; inferior median crests of caudal 
segment I distinctly defined only on the lateral 
side, the space between them not being grooved 
but filled up with numerous closely set coarse 
granules; the median groove of caudal segment II 
is usually filled up also, at any rate in the male. 
Male : last sternite very densely granular, the 
granulations typically occupying about 18-30 
irregular transverse rows ; sternites I-IV minutely 
granulated and finely wrinkled in the mesial parts. 
Upper surface of hand densely covered with not 
very coarse granules which are mostly isolated. 
Female : last sternite either densely and coarsely 
granular or granulation weak and nearly obsolete 
in the mesial parts ; secondary crests of hands 
obsolete ........ O. glahrifrom Pet. 
b^^ Inferior median crests of caudal segment T distinctly 
defined in hotJi sexes {the space betiveen them in segment I 
sometimes filled up with coarse granules in pugnax) ; 
tarsi of last tioo pairs of legs ivith 2 (sometimes otily 1) 
external spines heloiv in addition to the 4 on the outer 
terminal lobe, (a^^ and b^^.) 
a^^. Upper surface of carapace densely granular, the 
granules on the interocular area generally as well 
formed and as large as those on the sides and 
coarser than those at the hind angles (the inter- 
ocular area sometimes nearly smooth on the con- 
vexities behind and the sides of that area with 
coarser granulation). Inferior caudal keels quite 
smooth in the anterior segments, not granular, at 
the most interrupted by pits in the male. Last 
sternite of both sexes smooth in the middle, rarely 
very finely granular in the male. Chelicerse with 
stridulatory lamellae. Hands more or less yellow, 
with 4 black very strong keels above . . .0. ■wacer^Thor. 
b^^. Inferior median keels of caudal segment I of the 
male either strongly or weakly granular or at least 
crenulated ; carapace with finer granulation than 
in macer. . . . .0. latimanus Koch and its varieties. 
a. Chelicera; xvith stridulatory lamellce. 
1. Inferior median keels of caudal segment I 
distinctly but not very coarsely granular in 
the male, and the last sternite either nume- 
rously and rather closely granulated or 
irregularly rugose or transversely wrinkled 
mesially ; in the female the sternite mesially 
