A Sm-vey of the l^cnrpion Fauna of Honth Africa. 
117 
without the keel. The only satisfactory characters available for distiu- 
<j-uishiug the two species are the shape of the hands and the character of 
the basal pectinal tooth in the female. 
The inferior median keels of the second caudal segment are often weakly 
crenulated throughout in the females, but those of the first caudal segment 
are only very weakly so or quite smooth. The following measurements are 
based on adult specimens from Serowe : Length of carapace, M. 4* 75, F. 6 ; 
of tail, M. 31, F. 3275; of first caudal segment, M. 37, F. 4 ; of second 
caudal segment, M. 47, F. 4-8; of third caudal segment M. 5, F. 5-1 ; of 
fourth caudal segment, M. 575, F. 5-8 ; of fifth caudal segment, M. 6'5, F. 7 ; 
breadth of fourth caudal segment, M. 2-25, F. 2-5. 
'4. U. cARiNATus Pocock, Proc. Zool. Soc. 1890, p. 129, pi. xiv, fig. 3-3a 
(male only). 
This species is widely distributed in South Africa and is very variable. 
A number of local races can be recognised, leased on differences in the 
following characters : Elongation of the tail, especially in the adult male ; 
degree of enlargement of the basal pectinal tooth in the female ; width of 
hand compared with that of the brachium in the female. 
Dr. Purcell (17) has carefully redescribed both sexes of what he believed 
to be the typical form, and at the same time described several other forms 
as distinct species {ahtotii, karroolciis, and schlechteri). It is, however, 
impossible to say with certainty which should be designated the typical 
form, as the locality of the type, an adult male, is indefinitely located 
" South Africa, near the tropic of Capricorn," and its female characters are 
unknown. Dr. Purcell records carinatus from the following area : The 
western half of Cape Colony, with the exception of the strip along the south 
coast, extending from the Divisions of Malmesbury, Tulbagh, Worcester, and 
Prince Albert in the south to Bushmanland in the north. This form I now 
refer to as var. australis. Its characters are : Basal pectinal tooth of the 
female quite like the other teeth ; fourth caudal segment l|-2 times as long 
as wide in the male, 1^-lf times as long as wide in the female ; hand dis- 
tinctly wider than the brachium in the female. We have specimens which 
seem to be referable to this form from Steytlerville neighbourhood (Miss 
A. G-eard). 
Z7. carinattis var. alstoni Purcell (17) is characterised as follows: Basal 
pectinal tooth of female quite like the other teeth ; fourth caudal segment 
lf-2 times as long as wide in the female, and 2-1 times as long as wide in 
the male ; hand of female distinctly wider than the brachium. Dr. Purcell 
records alstoni from Worcester, Barkly and Kenhart divisions, stating that 
at Touw's River Station this for^n and the one here called australis occur 
together. 
V. carinatus var. karrooicus Purcell (17) has the following characters : 
