Thomson's Gazelle 353 



in the plains on both sides of the northern half of the mountain) in a north- 

 north-west direction to near the equator, and then trending slightly to the 

 east of north for about another degree over the Laikipia plateau, on the 

 north-eastern edge of which, where it is bounded by the Lorogi range, I 

 have myself met with it, 1 its limit here coinciding with that of Jackson's 

 hartebeest. 



It is found in herds, often of considerable size, and I have it on the 

 above-named unimpeachable authority that between Lakes Naivasha and 

 Nakuru it is more plentiful than anywhere else. Grant's gazelle is also 

 numerous wherever Thomson's is found, and the two kinds may often be 

 seen intermingling. 



Thomson's is quite a small gazelle. The measurements of an adult 

 male carefully taken by me were as follows : — 



Height at shoulder, 26 inches ; length from between horns to root of 

 tail, 38 inches ; tail, 7^ ; girth behind shoulders, 26 inches. 



Mr. Jackson has given me the following notes of dimensions taken by 



him. 



Average weight (male) about 55 lbs. ; female about 15 lbs. less. 

 Average height (male) about 26 inches ; female about 24 inches. 

 Average total length (male) about 49 inches ; female about 45.^ inches. 

 (The length here is from tip of nose to tip of tail.) 

 All the measurements given are in straight lines. 



It is a pretty and graceful little beast, not unlike Grant's in colouring, 

 but with the addition of dark stripes along the sides. 



The horns of the male are also somewhat similar to those of the latter, 

 but on a much smaller scale, taping about 1 3 inches to 1 5 inches when 

 mature. The posterior part of the head is thick and prominent, and has 

 the heavy appearance noticeable in that of a ram sheep. The female has 

 very small, thin horns, almost rudimentary in some specimens. 



There has been a little uncertainty about the East African gazelles, 



1 I have in my possession a skull obtained in this locality. 



