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Transactions of the Royal Society of South Africa. 
a narrow channel which is crossed by a series of well-developed ridges, and 
the vesicle in both sexes is deeply excavated at the base superiorly : militum 
is intermediate, the male resembling concolor in its stridulatory arrangement 
and vesicle, whilst the female resembles australis. 
Paeabuthus kaudtjs, Simon. 
The Kimberley Museum has an adult female of what seems to be this 
species labelled " Salisbury (Mr. Hirschhorn)." 
The mesial portion of the last tergite is coarsely shagreened, but hardly 
so strongly so as on the first caudal segment. The intercarinal surfaces on 
the lateral and superior portions of the tail are all rather closely granulated, 
and the last sternite is also granulated throughout, though not closely so in 
the mesial region ; carapace and tergites thickly granulated throughout. 
Fourth caudal segment very slightly narrower than the first. 
Parabuthus planicauda, Pocock. 
Craighead, Peddie District (B. Marais) ; Zuurberg Hotel, near the 
Waterfall (Dr. G. Eattray). 
The Zuurberg specimen is of unusual colour, the trunk and tail being 
dark brown throughout, the appendages and vesicle yellow. 
Parabuthus planicauda prenchi, Purcell. 
Ludlow (J. Behr) ; Steynsburg (C. S. G-robbelaar) ; Aliwal North 
(Sr. Stephany). 
Parabuthus capensis, H. and E. 
Ludlow (J. Behr) ; Williston (C. Hassard) ; Douglas (Dr. E. Broom). 
Parabuthus schlechteri, Purcell. 
Williston (C. Hassard) ; De Aar (Mr. Cowling) ; Van der Byl's Kraal 
(Mr. Van der Byl). 
Parabuthus villosus, Peters. 
Aus (J. C. Knobel). 
In this specimen, a female, the fourth caudal segment is about as wide as 
he first, and such is the case also in a male from a locality east of Walfisch 
Bay. 
Parabuthus flavidus, Pocock. 
Tsessel)e (E. C. Wilmot) ; Fourteen Streams (Mr. Glasson) ; Wirsing 
(Mr. Whiley) ; Pniel (Mr. Westphal) ; Barkly West (Mr. Furney). 
In this species a certian amount of variation is exhibited in the develop- 
ment of ridges on the stridulatory area of the first caudal segment, though 
such variation probably does not occur amongst individuals taken in any one 
