548 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io6 



Kemarks: The skull of the species hanisoni may be distinguished 

 from that of gregorianus by its longer and narrower build. From 

 swinderianus this species may be recognized by the lack of the anterior 

 cranial inflation. 



Thryonomys swinderianus variegatus (Peters) 



Aulacodus variegatus Peters, Reise nach Mossambique, Saugethiere, p. 138, 1852. 



(Mozambique.) 

 Aulacodus semipalmatus Heuglin, Nova Acta Acad. Caes. Leop.-Carol., Halle, 



vol. 31, art. 7, p. 5, 1864. (West of Djur River, to Fertit and Niam-Niam 



country, upper Bahr-el-Ghazal.) 



Specimen Examined: One, in BM, from Akanda, Bahi'-el-Ghazal. 



Remarks: The cane rats are all similar in external appearance but 

 may be distinguished by their cranial details. The species swinderi- 

 anus has the anterior portion of the skull inflated while in gregorianus 

 this portion of the skull is markedly less inflated. 



These two species may be further distinguished by the longer 

 bicolor taO in the former and the short concolor tail in the latter. 



It is quite apparent that the genus Thi^onomys needs a thorough 

 revision based on far more material than appears to be extant at 

 this time. 



Family Bathyergidae 



Cryptomys ochraceocinereus ctceni, new subspecies 



Type: CNHM No. 79485, sex unknown, young adult, sldn and 

 skull, from Magwe, 36 miles southwest of Torit, Equatoria Province, 

 Anglo-Egyptian Sudan. Obtained November 2, 1951, by J. S. Owen. 



Specimens Examined: Fom-, from: 5 miles east of Torit, 1 (MCZ), 

 Torit, 1 (MCZ) ; Nagichot, Didinga Hills, 1 ; Magwe, 36 miles south- 

 west of Torit, 1 . 



Diagnosis: Upper parts Blackish Brown but little hghter below; 

 hands and feet light brownish above; dorsal head spot, lips, chin, and 

 hne on mid throat ending in a spot on the breast, pure white. Skull 

 relatively flat, rostrum narrow, auditory bullae small but well inflated, 

 upper toothrow relatively short, interorbital width relatively small, 

 orbital notch greatly reduced. 



Measurements of the Type Specimen: Length of head and body 

 160; length of tail 10; length of hind foot 28* greatest length of skull 

 42.8; condyloincisive length 41.6; crown length of upper too thro »v 6.7; 

 greatest width across zygomatic arches 30.1; least interorbital width 



