480 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



Heliosciurus gambianus madogae Heller 



Figure 4,6 



Heliosciurus multicolor madogae Heller, Smithsonian Misc. Coll., vol. 56, No. 17, 

 p. 1, Feb. 28, 1911. (Uma, 50 miles north of Nimule.) 



Specimen Examined: The type. 



Measurements: The measurements of the type specmien are as 

 follows: Length of head and body 202 ; length of tail 204 ; length of hind 

 foot 44; condyloincisive length of skull 41.5; greatest width across 

 zygomatic arches 27.5; length of nasals 14.0; crown length of upper 

 too throw 9.0. 



Remarks: Intergradation between this form and hoogstraali has 

 been sho\vn in specim.ens from Torit. Even though the type localities 

 of these two forms are rather close together, there are color and 

 cranial differences which separate them readily. In color, they may 

 be separated by the belly which is white in hoogstraali and bnffy in 

 madogae. The skulls may be distinguished by the following: in 

 hoogstraali the skull is larger, has larger auditory bullae, has the 

 braincase less rounded, and with the upper too throws parallel and not 

 diverging posteriorly. 



It would be interesting to have more examples of these squiirels 

 from this area for a more critical analysis of their charactei-s. It may 

 well be that, when more material is available, especially from the type 

 locality of madogae, the name hoogstraali will have to fall as a synonym; 

 however, for the present and based on available material, the two kinds 

 are readily separable. 



Euxerus erythropus chadensis Thomas 



Figure 4,c 



Etixerus erythropus chadensis Thomas, Ann. Mag. Nat. Hist., ser. 7, vol. 15, p. 387, 

 April 1905. (Yo, Lake Chad.) 



Specimens Examined: Three, all in BM, from: Jebel Meidob, 1; 

 El Fasher, 1 ; 35 miles west of El Fasher, 1 . 



Measurements: An adult female from Jebel Meidob measures as 

 follows: Length of head and body 248 ; length of tail 207 ; length of liind 

 foot 58: length of ear 15; greatest length of skull 57.2; condjdoincisive 

 length 52.0; greatest width across zygomatic arches 31.0; length of 

 nasals 17.5; crown length of upper toothrow 11.5. 



Remarks: These animals are far paler in color than any of the 

 surrounding races of this species, and, apparently, the name chadensis 

 is to be recognized as occurring in the Sudan. The specimens agree in 

 detail with animals from Yo, Lake Chad, in color and in cranial 

 features. 



