A Survey of the Scorpio7i Fauna of South Africa. 
161 
long ; terminal tooth of superior crests in caudal segments II and III 
enlarged and subspiniform, of TV slightly enlarged ; sides of vesicle smooth^ 
becoming granular inferiorly ; upper surface of hand convex, not flattened,, 
and immediately below the inner margin of the upper surface there is a row 
of strong denticulations (similar denticulations occur in troglodytes, but not 
in gracilis) ; the lobe at the base of the movable finger is larger, deeper, and 
more acute than in other species known to me ; the post-ventral granular 
keel of the brachium is unusually weak, and owing to the dorso-ventral 
flattening of the segment that keel is very markedly interior to the outer 
surface of the brachium ; pectinal teeth 24. Total length 122 ; length of 
carapace 15, breadth of same 14-9 ; length of hand 30*6, breadth of same 
10-6 ; length of movable finger 15-7, of humerus 16-3, of hand-back 17*5 ; of 
last tergite 10, breadth of last tergite 11 ; length of first caudal segment 10, 
height behind 3-4, breadth 3-6 ; length of second segment 12, of third 
segment 12-7, of fourth segment 13-7, of fifth segment 13-8; of vesicle 9, 
height of vesicle 3'4, breadth 3-2. 
A half -grown male from Woodbush has 20-21 pectinal teeth and the 
sides of the vesicle are finely granulated. 
H. GUNNiNGi Purcell (Pis. XXI and XXX, figs. 28 85, also text-figs. 4 (5) 
and (4)), Ann. S. Af. Mus. i, p. 435 (female), 1899. 
Distribution : Type from Pretoria. The Transvaal Museum has it from 
Zoo Hill, Meintjes Kop, Koedoospoort, Derdepoort, Quaggas Poort, Eiet- 
fontein, Knoppieslaagte, Mooiplaats, Eoodeplaat, and Magaliesberg. 
The male of this species has been described by me (18). A larger 
specimen than the one described has the following measurements : Length 
of first caudal segment 10*6, of second segment 13-4, of third segment 13"5, 
of fourth segment 15-8, of fifth segment 15-5 ; of vesicle 8, height of vesicle 
3*4 ; length of last sternite 8-3, breadth of same 10, length of hand-back 13-6.- 
In the female the vesicle is quite smooth, the fifth caudal segment is only 
feebly denticulated superiorly, and the external surfaces of the patellae are 
very finely granulated throughout. This species is connected with troglodytes 
through the form described in this paper under the name of H. troglodytes 
mato])]Joa-nus. 
H. GRACILIS Hewitt (PL XXX, figs. 86 and 87, also text-figs. 4 (6) and 
(6)), Ann. Transvaal Mus. ii, p. 41, 1909. 
Distribution : Type from De Kroon, Crocodile River ; also known to the 
Transvaal Museum from the following localities in the Pretoria and Eusten- 
burg Districts : Posslyn, Zwartkopjes, Wolhuter's Kop, Bon Accord Quarry, 
and Sjambokstad. An adult male example, slightly larger than the one I 
previously described, has the following tail measurements : 20'3, 25*3, 25*6, 
27*5, 23" 75. This species is easily separated from the Serowe form of troglo- 
dytes by a number of characters apart from the elongation of the tail; e. g. the 
