50G PROCEEDINGS OF THE NATIONAL MUSEUM vnr. loe 



Mylomys cimningliamei christyi Thomas 



Mylomys christyi Thomas, Ann. Mag. Nat. Hist., sor. 8, vol. 20, p. 362, November 

 1917. (Mount Baginzi, Bahr-el-Ghazal.) 



Specimens Examined: Two, both in BM, from Mount Baginzi. 

 Measurements: No external measurements are available for a 

 male, but an adult female from Mount Baginzi m.casures as follows: 



Length of head and body 135; length of tail 140; length of liind foot 

 34; length of ear 19. 



The cranial measm-ements of an adult male and the same female 

 above are, respective!}^, as follows: Greatest length of skull 31.4, 33.4; 

 condyloincisive length 28.8, 30.8; crown length of upper toothrow 

 14.8, 16.0; greatest width across zygomatic arches 7.7, 7.2; least 

 interorbital width 4.1, 4.6; length of nasals 12.4, 12.8; width of rostrum 

 at level of antorbital foramen 4.0, 4.3. 



Remarks: All of the kinds of Mylomys have a grizzled appearance 

 on the dorsum simalar to that found in Arvicanfhis, but the hairs are 

 longer and much glossier than in that genus. The tail is more pro- 

 nouncedly bicolor and the belly is covered with pure white hairs which 

 are wiiite to the base. 



M. c. christyi differs from AL c. lutescens in somewhat smaller skull, 

 shorter toothrow, narrower anterior palatine foramina, more open 

 posterior choanae, and smaller auditory bullae. 



M. c. christyi differs from M. c. cunninghamei in the same way 

 except for the posterior choanae which are smaller and the rostrum 

 wdiich is shorter and narrower. 



Dasymys incomtus palustris, new subspecies 



Figure 6,a 



Type: CNHM No. 73902, skin and skull, adult male, from Lokwi, 

 25 miles south of Torit, Equatoria Province, Anglo Egyptian Sudan. 

 Obtained in June 1952 by J. S. Ow^en, original No. 2220. 



Specimens Examined: Five, from: Lokwi, 25 miles south of Torit, 

 3; Mongalla, 2 (BM). 



Diagnosis: General over-all color of upperparts near Snuff Brown, 

 strongly intermixed with black; no pure color at any place except a 

 thin subterminal band w^hich is near Tawny-Olive. Hands and feet 

 light brownish, tail dark browai and uniformly colored, entu-e under- 

 parts grayish white. Skull relatively small, anterior palatine fora- 

 mina relativelj^ large, nasals sliort, zj^gomatic arches quite flaring 

 posteriorly, bullae relatively small, upper cheekteeth relatively small. 



Measurements of the Type Specimen: Length of head and body 

 150; length of tail 140; length of hind foot 34; length of ear 16; con- 



