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Transactions of the Royal Society of South Africa. 
mesial side by granules, which, however, are comparatively few in nmnber, 
but in segment II those keels are quite distinct. The granules, like those on 
the last sternite, are comparatively coarse, some of them on the mesial 
portion of the sternite uniting into irregular, more or less transverse plicae. 
In the female the infero-median keels of the first caudal segment are quite 
well marked though irregular and deeply pitted, the intervening space not 
being filled up with granules, only a few occurring there. The last sternite 
is coarsely corrugated. 
Measurements. — Total length, M. 95, F. 95 ; length of carapace, M. 13, 
F. 15'2 ; distance between median eyes and hind margin of carapace, 
M. 3-8, F. 4-25 ; length of movable finger, M. 16-5, F. 15-6 ; breadth of 
hand, M. 9-2, F. 12-6 ; length of hand-back, M. 7-5, F. 7-9 ; length of fifth 
caudal segment, M. 12, F. 10*2 ; breadth of fifth caudal segment, M. 4-5, 
F. 3-9. 
The hand is somewhat like that of Jceilandsi, but the granulation on the 
last sternite of the male from Mfongosi is considerably coarser than in the 
Jceilandsi male. These two forms approach cjlahrifrons in certain respects, 
but the very close granulation of the mesial portion of the first caudal 
segment inferiorly in both sexes, and of the last sternite in the male, will 
distinguish that species. Moreover, in typical examples of glahrifrons, 
from the Zoutpansberg District or from Mashonaland, the finger keel is 
much broken up. Fairly typical examples of natalensis have recently been 
taken at Weeneu by Mr. J. M. K. Chadwick. 
I Opisthophthalmus glabeifrons, Ptrs. 
Barkly West (Furney). Stridulatory lamellae are present. Mochudi 
I (Knobel). Stridulatory lamellae absent. 
Opisthophthalmus gigas, Purcell. 
Kaalkfontein, South- West Africa (E. M. Truter). 
Female specimens reach a very large size, the carapace being 22*75 mm. 
long and the hand 15 mm. wide. 
Opisthacanthus chrysopus, Ptrs. 
Rikatla, Portuguese East Africa (H. Junod) ; Niwanedli Eiver, Zout- 
pansberg District (Transvaal Museum). 
This latter specimen, an adult male, resembles the form found at 
Serowe, having only 3*2 spines on the tarsi inferiorly. The carapace is 
less strongly granulated than in Zululand examples, though granules are 
well developed in the vicinity of the median sulcus. Pectinal teeth 7'8. 
Legs brown. 
Measurements. — Total length, 68 ; length of carapace, 9-3 ; length of 
hand, 14-3. 
This form I now designate as var. nov. imuci-spinulatus. 
