76 BULLETIN 99, UNITED STATES NATIONAL MUSEUM. 



Specimens of this rat from near the coast have shorter tails on the 

 average than those from the type region, but the difference is not 

 sufficient to make it necessary to recognize a separate subspecies. 

 For measurements of specimens see page 74. 



RATTUS KAISERI MANTEUFELI (Matschie). 



1911. Mils (Epimys?) manteufeli Matschie, Sitz.-ber. Ges. nat. Freunde Berlin, 

 1911, No. 8, p. 341. October. (Muansa, south coast of Victoria Nyanza, 

 German East Africa; type in Berlin Museum.) 



Specimens. — Forty-nine, from the following localities: 



British East Africa: Engare Narok River, 1 (Loring); Kaba- 

 lolot Hill, Sotik, 15, including 2 in alcohol (Heller); Loita Plains, 2 

 (Heller); Njoro Osolali, Sotik, 1 (Loring); Southern Guaso Nyiro 

 River, 26, including 6 in alcohol (Loring, Heller); Telek River, 4 

 (Heller). 



Specimens of the common Masai bush rat from the Southern 

 Guaso Nyiro and Sotik are distinctly darker, more brownish and less 

 reddish, than skins from east of the Rift valley. A form of this rat 

 has been described by Matschie from the southern shores of Speko 

 Gulf and it is highly probable that this is the subspecies of the lake 

 drainage in the Sotik. I do not at any rate feel that a form from 

 so near Matschie's typo locality should be described without actual 

 comparison with typical material and I see no reason for not referring 

 the Sotik specimens to manteufeli until such time as direct compari- 

 sons can be made. The specimens in the collection agree well with 

 the description. 



Heller studied the type of Mus manteufeli in the Berlin Museum 

 and made the following notes: 



Type A 182.11, Muansa, G. E. A.; in alcohol, skull extracted. Same color and size 

 as hindci. Skull, condylo-incisive length, 36.3; zygomatic breadth, 19; tooth row, 6; 

 length of incisive foramen, 8.2; diastema, 10. 



A rat described by Dolbnan^ from the Lemek Valley, between the 

 Amala River and the Southern Guaso Nyiro, as Epimys walamhse 

 amalx, is apparently not represented m our collections. It differs 

 conspicuously from the animal I have referred to manteufeli by its 

 white ventral surface. 



RATTUS CHRYSOPmLUS VOI (Osgood). 



]910. Mis voi Osgood, Field Mus. Zool. ser., vol. 10, No. 2, p. 11. February. 

 (Voi, British East Africa; type in Field Museum of Nat. Hist.) 



Specimens. — Twenty- two, from the following localities: 



British East Africa: Mount Mbololo, 1 in alcohol (Heller); 



Mount Sagalla, 7, including 1 in alcohol (Heller); Mtoto Andei, 



1 (HeUer); Ndi, 13 (HeUer). 



' Abstract Proc. Zool. Soc. London, 1914, p. 25, April 14, 1914. 



