230 BULLETIN 51, UNITED STATES NATIONAL MUSEUM. 
Upper incisors well developed, without distinct secondary cusps, 
the outer larger than the inner, and closely crowded against canine, 
the four teeth almost exactly in line with each other; lower incisors 
essentially as in Myotis. Canines well developed, not peculiar in 
form. Second upper premolar {pm 4 ) unusually large, but not pecul- 
iar in form, its cingulum when unworn produced antero-internaliy 
into the faint suggestion of a cusp ; anterior premolar not as large, 
but of essentially the same structure. First and second upper molars 
with length along outer edge about equal to transverse diameter, 
the cusps normal in position, the W pattern present but someivhat 
distorted by the reduced condition of the |> aras tyle ; hypocone 
absent. Third upper molar not unusually reduced, the protocone, 
paracone, mesostyle, and first commissure of normal size, the second 
commissure and its terminal cusp both small. The mandibular teeth 
show no special peculiarities. Skull essentially as in the medium 
sized species of Myotis. External form peculiar in the projecting 
tubular nostrils only, the animals otherwise resembling the species of 
Myotis or Kerivoula / feet rather small; metacarpals not graduated. 
Species examined. — Murium suilla (Temminck), M. aurita (Milne 
Edwards), M. griseus (Hutton), M. tubinaris (Scully), M. cyclotis 
(Dobson), and M. leucogaster (Milne Edwards). The two remain- 
ing species, M. few Thomas, and M. hilgendorfi (Peters), are so well 
described (the skull of M. hilgendorfi is figured) that there appears 
to be no doubt as to their position. 
Genus HARPIOCEPHALUS Gray. 
1842. Harpiocephalus Gray, Ann. and Mag. Nat. Hist., X, p. 259, December, 
1842. 
1842. Ocypetes Lesson, Nouv. Tabl. Regne Anim., p. 30 (part; included cav - 
ernarum=harpia , and s-uillus). Not Ocypetes Wagler, 1832. 
1866. Harpy ioceplialus Gray t , Ann. and Mag. Nat. Hist., 3d ser., XVII, p. 90, 
February, 1866. 
1878. Harpiocephalus Dobson, Catal. Chiropt. Brit. Mus„ p. 276 (part). 
Type-species. — Harpiocephalus rufus Gray = F espertilio harpia 
Temminck. 
Geographic distribution . — India and the Malay Region. 
Number of forms.— As now restricted this genus includes the type 
species only. 
Characters . — Externally as in Murina. Skull more heavily built 
than in the related genus but not differing noticeably in form except 
that the rostrum is relatively shorter, broader, and more abruptly 
truncate anteriorly. Teeth (Plates I, II, fig. 4) resembling those of 
