EAST AFRICAN MAMMALS IN NATIONAL, MUSEUM. 139 



smaller skull. My first idea was to consider these small specimens 

 merely dwarfs of the larger species, massaicus, but from the fact that 

 no specimens exactly intermediate in size between the two are found 

 among adult examples, and taking into consideration the restricted 

 range of the smaller animal while the larger form in some of its sub- 

 species ranges across the whole continent, I am forced to the theory that 

 macculus is a distinct species. Mr. Thomas has recorded the two 

 species from the same localities, and has named a subspecies of 

 macculus from the Welle area, Congo, ^ a region where the larger 

 species is abundant. The specimens from Rhino Camp, Lado, might, 

 theoretically, be supposed the same as the Welle River form, but I 

 am unable to distinguish them from the Uganda examples of macculus. 

 In describing his Arvicantlds pulchellus micropus from Lado, Heller ^ 

 apparently meant to name this small form, but in selecting his type- 

 specimen he chanced to take an example of the larger species, which 

 I am unable to distinguish from Lemniscomys siriaius massaicus. The 

 hind foot measurement of his type as given in the original description 

 is erroneous. It is stated to be 23 millimeters, but the foot actually 

 measures, dry and without claws, 24.5, while the collector's field 

 measurement with claws was 27 millimeters. The hind foot in speci- 

 mens I refer to macculus measures, dry, from 21 to 23 millimeters. 

 Five of the specimens referred by Heller to micropus, including the 

 single skin from Gondokoro, I have placed under macculus. 

 For measurements of specimens see page 140. 



LEMNISCOMYS STRIATUS MASSAICUS (Pagenstecher). 



Plate 36. 



1885. Mtis (Lemniscomys) barbarus L. var. massaicus Pagenstecher, Jahrb. 

 Hamb. Wiss. Anst., vol. 2, p. 45: Nat. Mus. Hamburg Ber., 1884, p. 45. 

 (Lake Naivasha, British East Africa.) 



1910. Arvicanthis pulchellus massaicus Roosevelt, African Game Trails, Amer. 



ed., pp. 473, 478 ("masaicits"); London ed., pp. 485, 490 {"masaicus"). 



1911. Arvicanthis pulchellus micropus Heller, Smithsonian Misc. Coll., vol. 56, 



No. 17, p. 9. February 28. (Rhino Camp, Lado; type in U. S. Nat. 

 Mus.) 



1912. Lemniscomys pulchellus sperynophilus Heller, Smithsonian Misc. Coll., 



vol. 59, No. 16, p. 11. July 5. (Mt. Gargues, Mathews Range, British 

 East Africa; type in U. S. Nat. Mus.) 



Specimens. — One hundred and three, from the following localities: 



Lado: Rhino Camp, 19, including 2 in alcohol and 7 odd skulls. 



Uganda: Hoima, 2, including 1 in alcohol (Loring); Kampala, 1 

 (Loring) ; Kisingo, 3, including 2 in alcohol (Loring) ; Ledgus, 1 in 

 alcohol (Loring). 



British East Africa: Engare Narok River, 7, including 2 in 

 alcohol (Loring); Engare Ndare River, 1 (Heller); Guas Ngishu 



• Arvicanthis macculus akka, Ann. and Mag. Nat. Hist., ser. 8, vol. 16, p. 479. Dec, 1915. 

 » Smithsonian Misc. Coll., vol. 56, No. 17, p. 9. Feb. 28, 1911. 



