Annals of the Transvaal Museum. 157 
November, 1907. I also took specimens from a hedgehog found near 
Pienaar’s Eiver a few weeks later. 
This genus is an intermediate from between Rliipicephalus and 
Dermacentor. The palpi and general form would lead one to place it in 
the genus Rliipicephalus, but the size of the posterior coxae and the absence 
of anal plates in the male bring it closer to Dermacentor. Nuttall and 
Warburton in 1907 described a species Rhipicentor bicornis, from which this 
g'enus was erected ; again, early in 1908, Neumann described the same 
species which he called Rliipicephalus gladiger, not knowing that it had been 
previously described. Upon examining the specimens of vicinus, 
which we forwarded to him for determination, he came to the con- 
clusion that they would warrant the establishment of a new genus, and by 
r rare coincidence proposed the name Rhipicentor. Before publication, 
however, he found that he had been anticipated by Nuttall and Warburton. 
There are only two species in the genus, bicornis and vicinus, the 
latter of which is found in the Transvaal. The co-types of vicinus are 
deposited in the Transvaal Museum, Pretoria. 
Genus DERMACENTOR. KOCH. 
Ixodes (ex p.), Latreille (1795). 
Dermacentor, Koch (1844). 
Pseudixodes, Haller (1882). 
Dermacentor, Koch (Neumann, 1897). 
Eyes present, base of rostrum wider than long, rectangular on the 
dorsal surface palpi short and thick ; stigmatic plates, short and comma 
shaped. Ventral surface of male without shields, similar to that of female. 
Coxae I bidentate in both sexes ; coxae IV in the male very much larger 
than the others. Dorsal shield usually ornamented with various designs. 
Only one species of Dermacentor has been reported from South Africa, 
D. rliinocerotus. I have never seen specimens of this species, but the 
description as given by Neumann follows — 
DERMANCENTOR RHINOCEROTIS. (BE GEER). 
The Rhinoceros Tick; 
Acarus rhinocerotis, He Geer (1778). 
Ixodes rhinocerinus, Denny (1843). 
Ixodes rhinocerotis, Gervais (1844). 
Amblyomma rhinocerotis, Koch (1844). 
Amblyomma rhinocerinus, Koch (1844). 
Dermacentor rhinocerotis, Gerstacker (1873). 
Dermacentor rhinocerotis (De Geer) (Neumann, 1897). 
Plate XVI, figures o, p (a, b). 
Male. — Body oval, wider behind, a little restricted at the level of the 
eyes. Dorsal surface (XVI, o) convex, 7 to 8 mm. long b}^ 5 to 5.5 mm. 
wide; ground colour of shield clear brick red on specimens from Natal, ochre 
yellow or greenish yellow on those from Mocambique, spots of reddish 
