96 
Annals of the Transvaal Museum. 
Measurements . — 
Total length , . IT mm. 
Length of carapace T.3 mm. 
Breacltli of carapace 5.5 mm. 
Greatest length of shield (measured between 
anterior and posterior lower edges) 9.8 mm. 
Greatest breadth of shield ... 7.8 mm. 
Depth of shield measured posfceromesially ... 1.75 mm. 
In the form of the shield this species resembles G. scutatum, 
Pure., from Krugersdorp, rather than any of the other known species : 
it differs therefrom in the occurrence of more definite lateral surfaces 
in the posterior third of the shield, in the hairiness of the shield and 
in the arrangement of the eyes of the posterior row. 
Heligmomerus Caffer , Purcell. (Novitates Zoologicae X, p. 305, 1903). 
Only two species of the genus Heligmomerus are recorded from 
South Africa, viz. : H. deserti, Pocock, described from the Kalahari 
(Ann. Mag. Hat. His. 7, 7, 286) and H. caffer , Purcell, from Shilo- 
wane. I believe that both are founded on juvenile examples, and 
although the two species will probably prove to be distinct it cannot 
be said that the distinguishing characters are yet known, for the 
ocular characters, on which specific distinctions are mainly based, 
differ greatly in juvenile and adult examples of the same species. 
The Transvaal Museum has three fine female examples, including two 
quite adult, from Moorddrif't, Waterberg District (coll. C. J. Swierstra 
and A. Roberts), which I suppose should be referred to caffer , but are 
possibly a distinct species. The striking characters of these speci- 
mens as distinct from an Idiops are : the great breadth of the fovea 
and the shortness of the ocular area. The frontal eyes are about a 
diameter or a trifle more apart, comparatively small, being not much 
larger than the other eyes : anteromedians 1-1J diameters apart : the 
quadrangle formed bv the frontal and anterior median eyes decidedly 
longer than broad, the anterior width only a little greater than, or 
subequal to, the posterior width : distance between the proteromedian 
eyes about H times their distance from the posterolaterals. The 
ventral surfaces of both pairs of spinners is beset with scattered small 
spines, whereas in Idiops such spines are chiefly formed on the penul- 
timate segment of the superior spinners, and the inferior spinners are 
either devoid of spines or carry only 1 or 2. 
Total length 33 mm. 
Length of carapace 12 mm. 
Breadth of carapace 10.7 mm. 
Idiops pretoriae (Poc.) (Acanthodon p., Pocock in Ann. Mag. Hat. 
History, 7, 1, p. 319). 
The Transvaal Museum has a very fine male example found in 
a trapdoor nest at Saltpan, Pretoria District (6/10/1914). It differs 
from the type only in a few minor points. The dentition of the 
chelicerae is 6.5, that of the type being 7.4. The bank of spinules on 
the anterior' surface of patella IV stretches the whole length of the 
segment on the side : in the type it stretches 5 / 6ths of the length of 
the segment and includes about 30 short spines. Patella III in both 
specimens has 13 spinules on its anterior surface, and in addition 4 on 
the anterior distal edge. Mr. Pocock says : — “ All the tarsi scopulate 
