MYOTIS. 



571 



Brachyotus Kolen., Allgem. Deutsch. Naturg. Zeitg. Dresden, 



neue Folge, n, 1856, pp. 131-174. 

 Isotus Kolen., Allgem. Deutsch. Naturg. Zeitg. Dresden, neue 



Folge, n, 1856, pp. 131, 174-177. 

 ALorestes Fitzing., Sitzungber, Math. Nat. Cl. K. Akad. Wiss. 



Wien, LXII, 1870, abth. i, p. 427. 

 Comastes Fitzing., Sitzungber. Math. Nat. Cl. K. Akad. Wiss. 



Wien, LXII, 1870, abth. i, p. 565. 



Form slender; tail long; face hairy; ears narrow; tragus, tapering, 

 straight, or recurved; dental formula characteristic. 



FIG. 107. MYOTIS NIGRICANS. 



No. 105644 Coll. U. S. Nat. Mus. 



Skull enlarged 3 times. Nose view enlarged q times. 



KEY TO THE SPECIES AND SUBSPECIES. 



A. Free border of uropatagium conspicuously PAGE 

 fringed M. thysanodes 572 



B. Free border of uropatagium not conspicuously 

 fringed. 



a. Forearm more than 40 mm. 



a/ Ear over 15 mm M. velijcr 573 



b. Forearm not less than 33 or more than 40 mm. 

 a.' Ear from meatus over ism. 



a." Back hair brown, belly Isabella. .. .M. peninsularis 573 



