•244 Miller — -1 jS^cio J)<it Protn Dominica. 



more abrupL angle at which the forehead rises above the level of the 

 rostrum. The skulls are so small that this angle is difficult to measure, 

 but it is approximately 18° in M. nigricans and 26° in M. dominicensis. 

 The teeth of the Dominican animal are smaller than those of Myotis 

 iiirifiainx. The crowns of the upper molars are slightly broader rela- 

 tively to their length, and the hypocone of the first and second is less 

 developed. Small premolars both above and below less crowded than 

 in the related species. 



Measurei/iefits. — External measurements of type: total length, 63 (78)*; 

 head and body, 30 (45); tail vertebne, 27 (33); tibia, 12.4 (14); foot, 7 (7); 

 forearm, 32.4 (33); first digit, G.4 (0): second digit, 28 (30); third digit, 

 48 (56); fourth digit, 41 (45); fifth digit, 37 (40); ear from meatus, 11 (— ); 

 ear from crown, 8 ( — ); width of ear, 6 (— ). 



C'ranial measurements of type: greatest length, 12.4 (13)*; basal length, 

 11.2 (12); basilar length, 9.4 (10); zygomatic breadth, 7.2 (7.4); inter- 

 orbital constriction, 3 (3.6): mandible, 8.8 (9.4); maxillary toothrow 

 (exclusive of incisors), 5 (5.4) ; mandibular toothrow (exclusive of incisors); 

 5 (5.4). 



Specimens examined.— Tyventy-five, all from the Island of Dominica. 



Remarks.— In all external features except size Myotis dominicensis ap- 

 pears to agree perfectly with M. nigricans. The cranial and dental 

 characters which separate the two species are very constant in an ex- 

 cellent series of specimens of each form. From the Myotis nesopolus of 

 Curasao the Dominican bat may be distinguished by its much more 

 slender skull and smaller audital bullte. 



*Measurements in parenthesis are those of an adult male Myotis nig- 

 ricans (No. 105,621) taken near Sapucay, Paraguay. 



