244 Miller ^1 N"ew Bat From Dominica. 



more abrupt 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 

 ni(jricans. 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. 



Measurements. External measurements of type: total length, 63 (78)*; 

 head and body, 36 (45); tail vertebrae, 27 (33); tibia, 12.4 (14); foot, 7 (7); 

 forearm, 32.4 (33); first digit, 6.4(6); 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 ( ). 



Cranial 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. Twenty-five, all from the Island of Dominica. 



Remarks. In all external features except size Myotis dominicensis ap 

 pears to agree perfectly with M. nigric.ans. 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 bullae. 



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

 rie.ans (No. 105,621) taken near Sapucay, Paraguay. 



