KUNGL. SV. VET. AKADEMIENS HANDLINGAR. BAND 48. N:0 5. 121 
Amblyomma hebreum (KocH) and Dermacentor rhinocerotis (DE GEERR). In the ven- 
tricle were found a few larv&e of some Oestride but they were too young to be 
determined according to Prof. SJÖSTEDT. 
The Rhinos in the Guaso Nyiri district had all, as far as could be observed, 
small horns, the front horn measured along the anterior curve in those shot only 
about 36—40 cm. 
According to several observers the Black Rhinoceros of the Somali countries 
shall be smaller than those in other parts of Africa, and a subspecific name >»soma- 
liensis> was created in the year 1900 by Count J. POTOCKI. DRAKE-BROCKMAN in 
his book about »the Mammals of Somaliland»? says »It has been said that it [the 
Rhinoceros of Somaliland] is smaller than the East African variety, but this is pos- 
sibly due to the poorness of its food supply during certain seasons of the year in 
Somaliland. The horns certainly seldom grow to any great length> — (108) 
p- 106). The Rhinoceroses north of Guaso Nyiri in the thornbush country live under 
analogous conditions and they were certainly poor. The ribs could be traced through 
the: skin (Pl. VII fig: 2). 
Quite recently LYDEKKER has compared two skulls of DRAKE-BROCKMAN'”S 
Rhinoceroses from Somaliland with a skull from >»HBEast Africa» and found? that the 
former »differ by the narrower form of the whole upper surface, both at the inter- 
parietal constriction and at the orbital expansion». The figures of the Somali skull at 
the side of the East African skull show a striking difference in breadth. Only two 
measurements of the breadth of these skulls are recorded, viz. the »breadth at 
orbits» and the »zygomatic width>, in LYDEKKER's paper. For comparison the same 
measurements of two South African, two East African, and two skulls from Guaso 
Nyiri are recorded in the accompanying table of measurements. From this can be 
seen that LYDEKKER's East African skull must have been unusually broad as none of 
the 6 skulls now measured attain the same orbital breadth, nor zygomatic width. 
nn 2 
LYDEKKER's Ane 4 WaAHL- | SPARR- 
specimens Guaso Nyiri 258 East BERG'S MAN'S 
4 RAS Afr.» from from 
| nn 1 re "Caffraria" Cape 
| Somali East Afr. 2 KM 
| cm | cm em cm. cm. cm Is iem: cm 
I EK ÅA I & = 3 L 4 - Å SEE I = SN 
IEengthi of upper aspect: hv sl...» .| 5155 | 55,5 56,5 54,5 56,5 57 | 6 55,5 
I I 
läBreadthi acvkorbitsy,rck aft. LR 23:01") 2055 23,5 2157 24,3 26 25,5 22,3 
| Zygomatic width . . : - = . « S-- 2Å SD 32,3 31 32 33,4 32,3 34 
Least width of skull at the postorbital 
COISURICUIOT «Ssd, ok her le ers de, ej ske — — 11,8 11,4 11.38 12,2 1 la) Il 
Width of across anterior horn boss. . — | — 13 11.6 13,3 14.3 13 13 
LYDEKKER's East African skull is thus beyond the average in these respects 
and accordingly, as this table of measurements indicates, the differences between 
somaliensis and other Black Rhinoceroses are not so great as will appear from 
1 Conf. L. G. NEUMANN: Ixodides. 'Ark. f. Zoologi Bd. 7 n:o 24 p. 4 Uppsala 1912. 
? London 1910. 
SAProc: Zool Soc. London 1911 Pp. 958— 960! 
K, Sv. Vet. Akad. Handl. Band 48. N:o 5 16 
