MAMMALS OF ANGLO-EGYPTIAN SUDAN — SETZER 479 



In one of the specimens pelage change is occurring on the tail and 

 the new hairs are coming in a strildngly banded black, white, and 

 gray pattern while the old hairs have faded to a rather uniform brown. 



Heliosciuriis gambianus Itoofisfrnali Setzer 



Figure 4,b 



Heliosciurus gombianus hooystrodU ReLzor, Proc. Biol. Roc. Washinglon, vol. 67, 

 p. 87, Mar. 22, 1954. (Ikoto, Torit District.) 



Specimens Examined: Sixteen, from: Ikoto, 9; Torit, 6; Obbo, 1. 



Measurements: Averages and extremes for six males and three 

 females from Ikoto are, respectively, as follows: Total length 430.1 

 (410-445), 423 (417-426); length of tail 227.7 (213-242), 207 (204- 

 209) ; length of liind foot 51.6 (51-53), 51.6 (51-52) ; length of ear 16.6 

 (15-17.5), 17 (16-18); greatest length of skull 48.4 (46.5-49.9), 49.2 

 (48.6-49.7); condyloincisive length 43.0 (40.7-44.9), 43.9 (43.5-44.6); 

 greatest width across zygomatic arches 28.4 (26.6-29.2), 28.7 (28.6- 

 29.0); length of nasals 14.9 (14.2-15.6), 15.1 (15.0-15.2); crown length 

 of upper tootlu-ow 9.2 (8.8-9.5), 9.1 (8.8-9.3). 



Remarks: This is the largest and darkest of the subspecies of H. 

 gambianus found in the Sudan. Intergradation with H. g. omensis 

 and H. g. lateris is apparent in the single specimen available from 

 Obbo and in three of the six specimens from Torit. 



Heliosciurus gambianus lateris Thomas 



Figure 4,6 



Heliosciurus multicolor lateris Thomas, Ann. Mag. Nat. Hist., ser. 8, vol. 4, p. 102, 

 August 1909. (Lado.) 



Specimens Examined: Two, the type and a specimen from Kajo 

 Kaji, 60 miles south of Rejaf, both in BM. 



Measurements: The type, an adult female, has no external measure- 

 ments on the tag, but the skull measures as follows: Greatest length 

 45.5; condyloincisive length 40.4; greatest width across zygomatic 

 arches 26.7; length of nasals 15.4; crown length of upper toothrow 8.5. 



Remarks: This squirrel is intermediate in color between bongensis 

 farther to the west and madogae to the east. In this respect only is it 

 intermediate, since in cranial characters there is no evidence of there 

 being any intergradation. 



This complex of gambianus squirrels occurring in the southern 

 Sudan is rather inexplicable. It seems without reason that tlii^ee 

 subspecies could occupy so small a geographic area as is apparent. 

 Yet, when specimens are examined, there are morphological characters 

 of the cranium as well as color differences of the skin to warrant the 

 separation of these kinds. 



386559—56 3 



