80 AMMODORCAS. LITHOCRANIUS. 



XXII. Elliot, Pub. Field Columb. Mus., i, 1897, p. 124. Zool. 

 Ser. Sclat. & Thos., Book Antel., 111,1897-1898, p. 219, pi. 



LXXIII. 

 DiBATAG. 



1-2. Adult G' Coll. South of Toyo Plain, Haud, Somaliland, E. 

 Africa. D. G. Elliot. 

 3. Juv. d^ Coll. South of Toyo Plain, Haud, Somaliland, E. 

 Africa. D. G ElHot. 

 4-5. Adult ? Coll. South of Toyo Plain, Haud, Somaliland, E. 

 Africa. D. G. Elliot. 

 6. Juv. 9 Coll. South of Toyo Plain, Haud, Somaliland, E. 

 Africa. D. G. Elliot. 



Genus 70. Litliooraiiius. 



Litocranius! Kohl, Ann. Mus. Wien, i, 1886, p. 79. Type Gazella 

 waller i Brooke. 



148. Lithocranius walleri (Brooke). 



Gazella ivalleri Brooke, Proc. Zool. Soc, 1878, p. 929, pi. lvi. 

 Litocranius ! {Gazella) walleri Kohl, Ann. Mus. Wien, i, 1886, p. 79, 



pi. V, fig. 3, pi. VI, fig. I. 

 Lithocranius walleri Thos., Proc. Zool. Soc, 1891, p. 207. Elliot. 



Pub. Field Columb. Mus., i, 1897, p. 126. Zool. Ser. Sclat. 



& Thos., Book Antel., iii, 1897-1898, p. 229, pi. lxxiv. 

 * Lithocranius sclateri Neumann, Sitzungsb. Ges. Naturf. Freund. 



Berl., 1899, P- 19- • Sclat. & Thos., Book Antel., iv, 1899-1900, 



p. 228. 



* Neumann (1. c.) has separated the Somali Gerenuk from those of other parts 

 of East Africa on account, as he states, of its less red color, lack of black knee 

 tufts, and larger horns. These do not seem to be characters of specific value, for 

 in quite a large number of Gerenuk obtained by myself in Somaliland and Oga- 

 den, there was found to be a great variation in the depth of the red coloring, 

 especially on the back (some individuals being very dark and others compar- 

 atively light), while the horns were of all lengths and weights even among 

 adult males. I should therefore regard depth of color and size of horns more 

 the results of individual variation than as indicating any degree of a distinct 

 rank. All of my Somali specimens, even the \"ery young animals, had black at 

 the knee, so this character? of Mr. Neumann is evidently found on all Gerenuk. 

 In my paper on Somali mammals I mention a difference observed in the Gere- 

 nuk from the north and south sides of Toyo Plain, in the presence or absence, 

 and its extent when present, of the conspicuous white stripe from the eyes to 

 end of nose. But after comparing many specimens from various localities, 

 the conclusion was apparently inevitable that there was only one species, and 



