ALLEN : MAMMALS FROM THE BLUE NILE VALLEY. 329 



body is 83^ in Heuglin's specimen, 85% in our immature individual. 

 In the adult the tail is relatively shorter — 73%; and the measure- 

 ments of the fresh specimen were: — head and body 112, tail 82, hinfl 

 foot 18, ear 15. The entire dorsal region from nose to base of tail is 

 smoke gray, becoming pale day-color on the checks and sides of the 

 body. The forearms and outer sides of the metacarpal and bases of the 

 metatarsal areas are gray like the back, and the tail is similar above. 

 The ventral surfaces, a spot below the eye, and at the base of the ear 

 are white. Capt. Stanley S. Flower, of the Gizeh Zoological Gardens, 

 generously presented an adult Acomys in alcohol taken June 19, 

 1912, at Eneikliba in Sennar Pro\ince, which is unquestionably the 

 same animal. The short, broad hind feet and the relatively short 

 tail (85 mm.) are equally characteristic. 



In the No\atates zoologicae, (1901, 8, p. 400) de Winton describes 

 as new% Acomys ivithcrbi/i, type from Kawa, south of Khartoiun. He 

 compares it with A. nubicus of Heuglin, from ^Middle Egypt, and men- 

 tions specimens from Shendi and Gebel Auli in the Nile \'alley. It 

 seems very close to cineraceus, with which it appears to agree in all 

 essential characters, so far as the description goes. Possibly the two 

 are identical, and ciucraccus should apply to the Acomys of the level 

 country of this part of the Nile \'alley. 



Acomys hunteri de\Yinton. 



Hunter's Spiny Mouse. 



Acomys hunteri de Winton, Novitates zoologicae, 1901, 8, p. 401, footnote. 



Among the rock cre\nces of Gebel Fazogli, at the Abyssinian border, 

 there occurred a second species of Acomys, which from descriptions 

 alone, I am unable to differentiate from hunteri, the type of which 

 came from the plains of Tokar, near Suakin, on the Red Sea. This 

 is described as red fawTi above, white beneath, w^hich is practically as 

 in an adult from Fazogli, except for the darker spines of the head and 

 back. A younger individual is grayer dorsally, the sides pale ochra- 

 ceous. The measurements given are: — head and body 105, tail 102, 

 foot 17.5, ear 16. Our two specimens measure: — head and body 

 104, 101, tail 98, 96, foot 18, 19, ear 16, 16. It will be obser\ed that 

 the tail is about 94 or 95 (in the tj^pe 97) per cent of the length of head 

 and body, hence much longer than in cineraceus. It differs strikingly 

 also in its slenderer feet, which are pure white instead of darker. 



