MAMMALS OF AXGLO-EGYPTIAN SUDAN — SETZER 481 



Eiixerus erythropus leucoutnbrinus (Riippell) 



Figure 4,c 



Sciurus leucoumhrinus Riippell, Neue Wirbelthiere zu der Fauna von Abj^ssiuien 

 gehorig . . . , Saugethiere, p. 38, 1835. (Abj^ssinia, Sennaar, and Kordofan 

 restricted to Abyssinia by Thomas.) 



Specimens Examined: Twenty -seven, from: Torit, 9; Obbo, 1 

 Katire, 1; Opari, 50 miles southwest of Torit, 1; Soba, Blue Nile, 1 

 (BM) ; Roseires, Blue NUc, 5 (BM) ; Wadjema, Blue Nile, 2 (BM) 

 Malek, 1 (BM) ; Kamisa, Dinder River, 3 (BM); near Gedaref, 1 

 (BM) ; no locality except Sudan, 2 (BM). 



Measurements: Averages and extremes of two males and three 

 females, from Torit, are: Total length 444 (425^63), 454 (448-461); 

 length of tail 205 (203-208), 202 (197-207); length of hind foot 67 

 (66-68), 65 (64-66); length of ear 15.75 (15.5-16), 16.3 (16-17); 

 greatest length of skull 58.0 (56.2-59.8), 60.1 (58.4-61.8); condyloin- 

 cisive length 52.5 (50.7-54.4), 54.0 (51.5-56.6); greatest width across 

 zygomatic arches 29.6 (29.6), 31.7 (30.9-33.3); length of nasals 16.8 

 (15.8-18.4), 18.4 (17.2-19.5); length of upper toothrow except P^ 

 10.1 (9.5-11.8), 11.4 (10.6-11.8). 



Remarks: In general, E. e. microdon from British East Africa has 

 a longer narrower rostrum and a more vaulted cranium than does 

 E. e. leucoumhrinus. In the present series from Equatoria Province 

 there are skulls which are close approximations to the former in 

 nasals but to the latter in the degree of vaulting; and the converse 

 is seen as weU as the intermediate t^^pe. However, I feel that the 

 squirrels from this Provmce are intergrades between microdon and 

 leucoumhrinus but, owing to the more constant approach in colora- 

 tion, that they are more referable to the latter. 



One specimen from Soba approaches the paleness of Hmitaneus but 

 cranially is identical to leucoumhrinus, and it is thus so referred. 

 This paleness of color may be due to seasonal fading of the pelage 

 and not to some genetic factor. 



Euxerus erythropus Hmitaneus Thomas and Hinton 



FiGLTRE 4,C 



Euxerus erythropus Hmitaneus Thomas and Hinton, Proc. Zool. Soc. London, 

 p. 255, July 6, 1923. (Zalingei, Darfur.) 



Specimens Examined: Eleven, all in BM. from: Kulme, Wadi 

 Aribo, 3; Jebel Marra, 2; Zahngei, 1: Billing, 2: Chak Chak, 2; 

 Talodi, 1. 



Measurements: The type, an adult female from Zalingei, and an 

 adult male from Jebel Marra respectively measure as follows: Length 



