38 K\rn AVDERSES 



section at base (Hjual to about -^ of \)., , in M. adversus scarcoly 

 -g- of \)./, in b(jth species j).j is completely in row. 



Ear. — Diiter margin of ear-conch in J\I. dryas considerably 

 more deeply and a})ruptly emarginateci above, than in M. adversus, 

 the upper half of tlie conch therefore narrower; tip rounded. Ears 

 not (juite reaching the tip of the muzzle when laid forwards. 



Tragus straight, attaining its greatest width far below the 

 middle of the inner margin, tip narrow and subacutely pointed; 

 inner margin practically straight from base to tip; outer margin 

 above the basal notch (the deep notch opposite the base; of the 

 inner margin) in its lower two thirds convex, in its upper third 

 liatly concave; the whole of the outer margin very finely serrate; 

 the tip of the tragus does not quite reach th(> middle of the inner 

 margin of the ear-conch. 



Foot. — Markedly smaller than in AI. adversus: length 

 '.).8-10 mm., against 11.8 in the Java species. 



General size. — Externally M. dryas is a})parently a triile 

 smaller than M. adversus: forearm (two specimens, the types) 

 88.0-39.8 mm., as against 41.o in the type of M. adversus. 

 The difference in the length of the tooth-rows is infinitesimal : 

 upper teeth, c-m^, .').9-() nun. in M. dryas, (1.8 nnn. in M. ad- 

 versus. 



Other external cliaracters. — Calcar very long, ])ordering 

 ^/^ of the distance from foot to tail vertebra. Posterior margin of 

 interfemoral , between tip of calcar and tail, fringed with hairs. 

 Last tail vertebra projecting beyond membrane. Wings from l)ase 

 (one specimen) or middle (the other) of metatarsus. 



Affinities. — The general characters of M. dryas assigns it 

 a })lace in the « subgenus » Leiiconoe as defined by Dobson in 

 his Catalogue (p. "IHi)) : calcar very long , interfemoral forming a 

 very acute angle in the centre of its free margin behind, tail 

 projecting by the last vertebra from the membrane; foot rather 

 strong, though proportionally less so than in the majority of species 

 placed by Dobson in this section. Its nearest known ally seems 

 to be the species with which I have compared it here, M. 

 adversus. 



Remark. — This is th(> first record of a sjiecies of Myotis 

 from the Andamans, The occurrence of ihe genus in these islands 

 was, of course, to be expected. 



