14 SMITHSONIAN MISCEIvIvANEOUS COLLECTIONS VOL, 56 



Characters. — Antorbital plate with a straight anterior margin, 

 with scarcely any concavity; bullae small, coloration brownish; size 

 large. 



Coloration. — General dorsal coloration Front's brown, becoming 

 grayer on the sides and merging gradually into the olive-yellow 

 wash of the gray under parts. Dorsal pelage made up of long 

 black hairs which overlay the nearest shorter ones, which are 

 terminally seal brown, then broadly tawny and basally slate. Limbs 

 light wood brown. Tail showing very little hair, the annulation 

 conspicuous, color broccoli brown. 



Measurements. — Head and body 160 mm.; tail, 156; hind foot, 

 32. Skull: condylo-incisive length, 36.5; zygomatic breadth, 18.5; 

 nasal. 13.5; palatal foramina, 8; length tympanic bullae, 5.6; length 

 upper toothrow, 7.3; diastema, 11. 2; condylo-incisive length of 

 mandible, 26. 



This species is a much browner species than medius, with larger 

 body size. The skull differs decisively from a large series of 

 helukns from British East Africa in its straight-edged antorbital 

 plate, which is scarcely more angulated at its upper edge than 

 in Epiniys alexandrinus. 



There is one other specimen from Butiaba in the collection, and 

 a third from Rhino Camp. 



DASYMYS SAVANNUS, new species 



Kenia Swamp Rat 



Type from Fort Hall, British East Africa; adult female, number 

 164471, U. S. Nat. Mus. ; collected by J. Alden Loring, October 28, 

 1909; original number, 8182. 



Characters. — Coloration umber-brown, skull with antorbital plate 

 much angulated and produced, giving the antorbital vacuity great 

 depth; size smaller than in helukus; tail essentially naked. 



Coloration. — Upper parts umber, overlaid medially with black, 

 the individual hairs tawny-ochraceous, with dark brown tips and 

 slaty bases mixed with longer black hairs. Sides lighter, purer 

 ochraceous, becoming more grayish where they meet the olive-gray 

 wash of the lower parts. Feet pale brown. Ears hair brown, 

 clothed with minute grayish hairs. Tail like the ears in color, but 

 quite naked, with the annuli showing conspicuously. 



Measurements. — Head and body, 156 mm.; tail, 146; hind foot, 

 29.5. Skull: condylo-incisive length, 37.5; zygomatic breadth, 19; 



