A Survey of the Scorpion Fauna of South Africa. 
137 
packed, small, low tubercles, which are mostly rounded but some of irregular 
shape, the finger keel more or less continuous and smooth in its distal half, 
broken up in its proximal half, the secondary keels absent or very indistinct ; 
the postero-superior crest of the brachium distinct in both sexes but not 
strongly developed ; sternites all quite smooth ; inferior surface of first 
caudal segment quite without granules, or with only a few weak ones, the 
inferomedian and inferolateral keels strong, not granular, but with a few 
coarse pits, and occasionally crenulated in the posterior half ; those of the 
second segment are similar but more or less crenulated, especially in the 
posterior half ; terminal tooth of superior crests in third and fourth caudal 
segments enlarged and spiniform ; first 6 abdominal tergites finely granular 
throughout in the male, for the most part smooth and polished in the 
female, but very finely granular on the matt areas on each side of the median 
keel ; stridulatory lamellae present on the chelicerae ; superior lobe of 
tarsus of the legs slightly shorter than the lateral lobes, the fourth tarsus 
with 2 (or 3 or only 1) spines anteriorly below, in addition to the 4 on the 
anterior terminal lobe ; pectines with 20-23 teeth in the male, 15-18 in the 
female, the scape strongly angular at the base behind in the male, rounded 
in the female. 
Measurements. — Total length, M. 93, F. 91 ; length of carapace, M. 13*5, 
F. 12-6; of movable finger, M. 21-3, F. 13-6; of hand-back, M. 10-5, F. 9 ; 
breadth of hand, M. 9, F. 10-2 ; length of humerus, M. 15-8, F. 10-6 ; of 
brachium, M. 14, F. 10-25 ; of tail, M. 55-6, F. 457; of vesicle, M. 13-25, 
F. 10-3 ; width of first caudal segment, M. 5, F. 4-5. 
Coloration. — Usually dull reddish-brown, the legs yellow, the vesicle also 
yellowish ; interocular area paler than the sides of the carapace but not 
strongly contrasting therewith. 
Distribution : Dr. Purcell records this species from Matjesfontein, Touws 
Eiver Station, Sutherland, Middelburg, and Colesberg. We have it from 
Victoria West (P. D. Morris, B. Marais), where the allied species 0. Jcarroo- 
ensis Pure, also occurs. 
The elongation of the humerus and of the fingers, in the male, is a 
marked feature of the species ; in a specimen from Jagersfontein (Durban 
Mus. Coll.), however, the humerus is only slightly longer than the brachium 
or the carapace. The degree of convexity of the upper surface of the hand 
in the female varies somewhat ; an example from the Colesberg district has 
the hand rather more convex than examples from Victoria West. 
28. O. cRASsiMANUs Purccll (PL XXV, fig. 56), Ann. S. Af. Mus. vol. i, 
p. 164, and ii, p. 200, 1899. 
Distribution : Types from Jackalswater in Namaqualand division and 
other specimens taken in various localities in the divisions of Namaqualand 
and Kenhardt and from Van Wyks Vlei, Carnarvon. 
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