A MONOGKAPH OF THE BATS OF NOKTII AMERICA. 55 



The Vespei'tiliouidie have liitlieito einbi'iiccd all the small naked- 

 nosed bats not included in tlie molossine and eniballaniirine groni)s. 

 I have elsewliere* given reasons for assigning yatalKs to a separate 

 family in close alliance with the })hyllostomine bats, notwithstanding 

 that the nose-leaf (at least in the adult) is absent. 1 have no doubt 

 that Thyroptera, Corynorhinn.s, Endcrma, j^oetllio, and Antrozom are 

 also to be separated from the true vespertilioniiie forms. The intervals 

 between these outlying genera are unequal. Thyroptcra is in close re- 

 lation to Hatalus; Corynorhinu.s to Euderma. Yet the exhibition of 

 phyllostomine characters, suggest that these genera are aberrant ex- 

 pressions of the leaf-nose types, and are probably the forerunners of the 

 genera of the group in which Atalapha, Vespeytilio, Adelonycferis, Yes- 

 perugo, Lasionyeteris, and Nycticejus are found. 



Xoctilio exhibits jihyllostomine affinities, but approaches more nearly 

 to the molossine than to the vespertilionine group, though the genera 

 JSfocttiUnia, Miniopterus, and (JhaUnolohns may here be said to occupy 

 an intermediate position. 



Antrozous in like manner can be shown to have originated from a 

 phyllostomine stem, though probably at points independent of either 

 of those above named. 



1. Corynorhinus macrotis (Lecoute). The Big-eared liat. (I'late ^I, vin. 



Plecoins macrodn Lecoute, Cur. Animal Kingdom (McMurtries' ed). Appendix i. 



1831, 431; Dobsou, Cat. Cliirop. Brit. Mus., 1878, 180. 

 Plecoins lecontii Cooper, Ann. Lye. Xat. Hist., N. Y., iv, 1837, 72. 

 Sy»oius lecontii Wagner, Scbreb. Saiigetli., Su2)pL v., 185.5, 720. 

 Si/notns macrotis If. Allen, Monog. X. A. Bats, 1861, 63. 

 Corynorhinus macrotis H. Allen, Proe. Acad. Nat. 8ci., Phila., 1865, 173. 



Diagnosis. — Phalanges of the fourth and fifth digits of equal length. 

 The maxillary central incisor not bifid. The post-digital nerve of the 

 fourth interspace arises at a point midway between the distal and 

 proximal ends of the fourth metacarpal. 



The following is the manal formula: 



Second interspace 3 



Tbi rd interspace 15 



Fourtb interspace 27 



Forearm 40 



Description.— E-dvs nearly twice the length of the head ; internal 

 basal lobe rudimental, rounded, free iuferiorly, but lost in a mere line 

 above and ending on the internal border at the headfold in a small non- 

 prqjecting tubercle. The internal border moderately convex, turned 

 abruptly backward so as to lie ui)on the posterior surface of the auricle, 

 and is lost on the headfold. The tip is small, rounded; outer border 

 nearly straight, not incised. The first scallop alone is present; it passes 

 downward and forward to near the angle of the mouth, well to the out- 

 side and beyond the external basal lobe, which forms a rounded sharply 



"Proc. Xat. Museui.i. 



