2 SMITIISD.XIAX .M1SC1:i,1,.\M;()1;S Ci)LLKCTU).\S \ui.. 54 



DASYMYS HELUKUS, new species 



Plate i, b. Skli.i,. Xatlkau Sizk 



Type from Sirgoit, Guas Xgishu plateau, British East Africa ; 

 adult male number 162889, U. S. Nat. Mus. ; collected by Edmund 

 Heller, November 19, 1909; original number, 1239. 



Diagnosis. — Like Dasyniys incouiptus of Xatal, but skull with less 

 heavy rostrum, audital bullae distinctly smaller, and palate wider in 

 proportion to toothrow; teeth less robust than those of D. incouiptus, 

 the reentrant angles on anterior border of first and second laniin.T 

 of m' and m- better developed. 



Coloration. — Dorsal coloration a mixture of black and tawny, the 

 black predominating greatly, giving a general blackish effect, the 

 individual hairs annulated with tawny and black with a mixture of 

 longer black hairs. Color of sides more grayish and merging gradu- 

 ally into the buffy wash of the lower parts. Feet and ears thinly 

 clothed with dusky hairs. Tail blackish with prominent annulations 

 and a sparse covering of short black hairs. 



Measuroncnts. — Head and body, 185; tail, 143; hind foot, 34; 

 ear, 22. Skull : condylobasal length, 37.8 ; basilar length, 33 ; zygo- 

 matic breadth, 20.2; diastema, 11.8; mandible, 24; maxillary tooth- 

 row, 7. 



This species has somewhat the appearance of M. alcxandrinns, 

 but the hair is much softer and longer and the tail is conspicuously 

 shorter. 



LEGGADA NAIVASH^, new species 



Plate 2, a, Skull, Natural Size 



Type from eastern edge of Naivasha plains, at the base of the 

 Aberdare Mountains, British East Africa; adult male, number 

 162885, U. S. Nat. Mus.; collected by Edmund Heller. October 18, 

 1909; original number, 1186. 



Coloration. — Upperparts blackish with a slight mixture of tawny 

 hairs, the pelage consisting of long black hairs and shorter tawaiy 

 and black annulated ones ; sides somewhat more tawny than the 

 median dorsal region. Underparts pearl gray, whitening about the 

 throat and chin, sharply defined from the dark sides, the hair every- 

 where plumbeous basally. Limbs dusky 1)rown above, below gray 

 like the belly. Tail black above, dark brown below, thinly haired 

 throughout. Ears externally thinly haired with black, internally 

 clothed with tawnv hairs. 



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