EAST AFRICAN MAMMALS IN" NATIONAL, MUSEUM. 147 



material is concerned. In cases where alcoholic specimens are from 

 localities represented by good series of skins and skulls, it has seemed 

 unnecessary to remove the skulls. Such specimens have been iden- 

 tified with the series of skins and skulls taken by the same collector 

 at the same time and place. 



For measurements of specimens of the swamp rats of the genus 

 Otomys see table, pages 150-151. 



OTOMYS THOMASI THOMASI Osgood. 



1910. Otoviys thomasi Osgood, Field Mus. Nat. Hist., Zool. ser., vol. 10, No. 2, 

 p. 9. February. (Molo, British East Africa; type in Field Mus., Chicago.) 



Specimen. — One, as follows: 



British East Africa: Guas Ngishu Plateau, 20 miles north of 

 Ravine (Heller). 



OTOMYS THOMASI SQUALUS Dollman. 



1915. Otoviys thomasi squalus Dollman, Ann. and Mag. Nat. Hist., ser. 8, vol. 15, 

 p. 155. January. (Mount Kinangop, Aberdare Range, British East 

 Africa, 12,000 feet; type in British Museum.) 



Specimens. — Twenty-one, including seven in alcohol, as follows: 

 British East Africa: Aberdare Mountains, summit, 10,500 to 



11,000 feet (Heller). 



Two females collected on October 11 contained one large embryo 



each. 



OTOMYS ORESTES Thomas. 



1900. Otomys inoratus orestes Thomas, Proc. Zool. Soc. London, 1900, p. 175. 



(Teleki Valley, Mount Kenia, at 13,000 feet, British East Africa; type in 



British Museum . ) 

 1910. Otomys irroratus orestes Roosevelt, African Game Trails, Amer. ed., p. 



472; London ed., p. 484. 



Specimens. — Sixteen, as follows: 



British East Africa: Mount Kenia (Loring, Mearns). 



These specimens were trapped on the western side of the mountain 

 at altitudes of 10,700, 13,500, and 13,700 feet. Tlie last upper molar 

 has six laminae in all specimens except one (No. 164329) in which there 

 are distinctly seven, the last very small. Tliis specimen is unques- 

 tionably orestes, however, as it agrees with the other specimens of the 

 series in color, size, and the peculiar arched appearance of the skull, 

 as opposed to 0. ti'opicalis. It is the most aged specimen in the 

 series. 



OTOMYS DOLLMANI Heller. 



Plate 37. 



1912. Otomys orestes dollmani Heller, Smithsonian Misc. Coll., vol. 59, No. 16, 

 p. 5. July 5. (Mount Gargues, Mathews Range, British East Africa, 

 7,000 feet; type in U. S. Nat. Mus.) 



Specimens. — Seven, including one odd skull, as follows: 

 British East Africa: North Creek, Mount Gargues, at 6,000 feet 

 (Heller) .1 



> stated 7,000 feet in original description but specimens are all labeled 6,000 feet. 



