NO. 2188. MAMMALS FROM ISLANDS OFF SUMATRA— LYON. 441 



of maxilla covering roots of canines less enlarged ; zygoma more slen- 

 der; audital buUae smaller; teeth are slightly smaller and toothrow 

 shorter. 



Measurements. — Type: Head and body, 65 mm.; forearm, 55; 

 tibia, 32 ; foot, 17 ; width of rostrum at apex, 5.2 ; condylobasal length, 

 22.5; width of braincase, 10.3; maxillary toothrow, 9.2. 



Specimens examined. — One, the type. 



Remarlcs. — Megaderma niasense is apparently the smallest member 

 of the genus. It is conspicuously smaller than the other species from 

 the Barussan Islands, but the smallest individuals of Megaderma 

 trifolium closely approximate it in size. 



Family VESPERTILIONIDAE. 



MYOTIS ABBOTTI, new species. 



Type-specimen. — Preserved in alcohol, skull removed, adult female, 

 ho. 121611, U.S.N.M., collected on North Pagi Island, January 3, 

 1903, by Dr. W. L. Abbott; original number 2191. 



GeograpJiic distribution. — Only known on North Pagi Island, but 

 probably occuring on South Pagi as well. 



Diagnostic characters. — A member of the muricola group of Myotis, 

 distinguished by its distmctly larger size. 



Color. — Fur of upperparts with general effect of mimimy-brown, 

 bases of hau's blackish-brown, and showmg through to a moderate 

 extent; fur of underparts, light buffy-brown, with the blackish-brown 

 bases showmg through to a considerable extent ; membranes and ears 

 varymg between natal and bone-brown. 



Slcull and teeth. — Compared with the skull of Myotis muricola 

 (Sumatran specimens) the skull of 21. ahhotti is distmctly larger 

 throughout and more angular, especially about the rostrum; the brain- 

 case is relatively more swoUen than that of M. muricola. The teeth 

 of M. ahhotti are like those of M. muricola, only larger. 



Measurements. — Type, and paratype No. 121610: Forearm, 38, 

 38 mm.; tibia with foot, 27, 26.5; tibia alone, 16.8, 17.2; ear from 

 crown, 11.5, 1 1 .5 ; condylobasal length of skull, 13.8, 13.5;interorbital 

 constriction, 3.8, 3.8; width of braincase, 7.4, 7.4; maxillary toothrow, 

 including canine, 5.5, 5.5. 



Remarlcs. — Myotis ahhotti appears to be a well characterized form, 

 distmguishable at a glance from M. muricola by its longer forearm, 

 greater size of skuU, and more swollen braincase. Its great differen- 

 tiation is in agreement with that of many of the other mammals of 

 the Pagi Islands. 



MYOTIS NIASENSIS. new species. 



Type-specimen. — Preserved m alcohol, skuU removed. No. 121876, 

 U.S.N .M., adult female, collected by Dr. W. L. Abbott at Siaba Bay, 

 Nias Island, March 20, 1903; original number 2402. 



