Genera Microiijctei is (7/^/ (« Ijjihoiiycloris. a 1 



Nnmo preoccupied by Schizosfomi, Bronn, 1k3"), a freniis of 

 Molliisni. 

 18(i0. Micronycteris, J. E. Gray, P. Z. S. p. W^. — Type: Micronyderis 

 mcgalolis. 



The siil)j()itic(l cliaiMC'tcrization is confined to tlic features 

 in wliicli Mirroiii/cteris dillers fVoni Ghjphonijcteris : — 



Skull*. — Facial portion, itnniediateiy in front of orbits, 

 not conspicuously inflated. Basioccipital pits, antero- 

 iuternally to cochlcie, sluiUow. 



Dentition f. — z" not especially modified (compare Glyphu- 

 mjcteris). Upper canines not shortened, their vertical bein;^, 

 about twice tlieir antero-postcrior basal diameter. The 

 " heel" of jf represented only by a very narrow ciuguluin. 

 Inner border of the cingulum of p^ with a distinct shallow 

 ttnarffina/ion, dividimj the cinyiilum into an antero-internal 

 (" cusp () " X) '^"^ apostero-internal tubercle ('* cusp 7 "). 



Ears. — Conjoined by a transverse band across the head. 

 Outer margin of ear-conch not distinctly concave in its 

 npper half. 



Chin. — A triangular naked space (in skins and alcohol 

 specimens often contracted to a deep furrow), flanked by 

 two oblique warts, converging downwards. 



Wings. — Third and fourth metacarpal snbcqual in length, 

 fifth the longest. First and second phalanx of third digit 

 subequal. 



Species. — Four species were catalogued by Dobson in 

 1878 : M. hirmta, megalotis, minuta, Behni. Since that 

 time the following three species have been described : M. 

 brachyotis (Dobson, 1879), M. microtis (Miller, 1898^, M. 

 hypvh'Kca (J. A. Allen, 19C0). I have satisfied myself that 

 M. Behni is a Glijphonijcteris \ the same is probably the case 

 with M. brachyotis ; and M. hypolcucn is apparently indis- 

 tinguishable from M. minuta. The getuis Micronycteris, as 

 here restricted, therefore comprises the following four 

 species : M. megalotis, microtis, minuta, and hirsuta. 



Range. — From S. Brazil and Peru to xMexico. 



* The slaill of M. minuta is figured in ' Exped. Castelnau Atnei ique 

 du Sud,' Mamm., pi x. tigs. 4, 4 a. The skull nf M. ineyalotU in Dobsoua 

 'Cat. Chir. Brit. Mu?.' pi. x.vvi. figs. 3, 3«, .3 6 (1878; ; and in Herluf 

 Winge's " Jordfundue og nulevende Flagermus fra Lagoa Santa," E Museo 

 Lundii, ii. pt. 1, pi. i. tig. 1 (1892). 



t I write the dental formula of Micronvcteris, Glyphonyctcris, and 

 allied genera as foUosvs :-'' .'' '^-?-' ^'-"'' '"' '"'. 



\ On the probable homologies of the cusps of manmialian teeth, see 

 Herluf Winge, " Om Pattedyreues Tandskifte isjer med Hen>yn til 

 Taendernes Former," Yidensk. Medd. Naturhist. Foren. Kbhvn. 1882, 

 pp. lo-69, pi. iii. ; and a series of papers by the same author in E Museo 

 Lundii. 



