MAMMALS OF ANGLO-EGYPTIAN SUDAN — SETZER 533 



Lophuromys aquilus margarettae Heller 



Loyhuromys aquilus margarettae Heller, Smithsoniau Misc. Coll., vol. 59, No. 16, 

 p. 7, July 5, 1912. (Mount Gargues, Matthews Range, British East Africa.) 



Specimens Examined: Twenty-three, from: Gilo, Imatong Moun- 

 tains, 11 (6, MCZ); Lotti Forest, Imatong Mountains, 4 (1, MCZ); 

 Magwe, 36 miles southwest of Torit, 1 (MCZ); Issore, Imatong 

 Mountains, 2 (BM) ; Lomoling, Imatong Mountains, 1 (BM) ; Kitibol, 

 Imatong Mountains, 2 (BM); Kipia, Imatong Mountains, 2 (BM). 



Measurements: There are no adult females of this species in the 

 collection, but the measurements of an adult male from Gilo, Imatong 

 Mountains, are as follows: Length of head and body 132; length of 

 tail 70; length of hind foot 21 ; length of ear 11 ; condyloincisive length 

 of skull 28.4; posterior edge of M^ to front of incisor 14.5; length of 

 upper toothrow 4.9; least mterorbital width 5.9; length of nasals 

 12.8; width of rostrum at level of antorbital foramen 3.7; width 

 across M^-M^ 6.6. 



Remarks: In general these specimens agree with the type of 

 margarettae but are somewhat paler in dorsal color. The specimens 

 from the Lotti Forest are markedly paler. It may be that these 

 represent a new subspecies but until the amount of variation, indi- 

 vidual, sexual, and specific, is known I feel that it is best to refer 

 these to margarettae as being indicative of then- nearest relationship. 



There are certain peculiarities of the skull of the two species aquilus 

 and sikapusi that may be of significance in determining the species. 

 In the latter there is a pronounced bony tuberosity at the posterior 

 end of the bony palate which is marked in immatm-es and becomes 

 progressively more noticeable as the animal ages. This tuberosity 

 is inconspicuous in young specimens of aquilus and in adulthood 

 is about as in young of sikapusi. In addition, the sculpturing along 

 the lateral margins of the palate is more pronounced at all age levels in 

 sikapusi and the posterior palatine foramina are, in general, longer 

 and more open than in aquilus. This size and shape of the pos- 

 terior palatine foramina in certain instances shows an overlap, so 

 the degree of usefulness is questionable. However, combining the 

 color of the dorsum and the cranial features as outlined above as 

 weU as under the remarks section for sikapusi pyrrhus, the animals 

 from the Sudan can be distinguished with a certain degree of 

 accuracy. 



Lophuromys sikapusi pyrrhus Heller 



Lophuromys pyrrhus Heller, Smithsonian Misc. Coll., vol. 56, No. 17, p. 10, 

 February 28, 1911. (Rhino Camp.) 



Specimens Examined: Twenty-thi-ee, from: Gilo, Imatong Moun- 

 tams, 15 (1, MCZ); Nimule, 4 (MCZ); Katire, 2 (1, MCZ) ; Yambio 

 District, 2 (BM). 



