224 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 
specially elongated (laid forward they do not reach tip of muzzle), 
joined across forehead. Nostrils opening upward and outward on a 
flat, median space between two high lateral swellings and behind a 
prominent median pad. Metacarpals very slightly graduated. 
Species examined. — Barbastella barbastellus (Schreber). 
Remarks. — Although differing very notably from the Plecotine 
Plecotus , Corynorhinus and Euderma in the dental formula, the 
small audital bullse, and the simple zygoma, Barbastella is probably 
more closely related to these three genera than to any others. With 
them it shares the peculiar elongated, rounded, and rather low brain 
case, the weak rostrum, the distinctly graduated lower incisors, the 
slenderness and relatively great height of the protoconid of the lower 
molars, and a certain aspect of the upper molars. The last char- 
acter is difficult to define, but it probably results from the wide 
spaces between the teeth, the large protocone, and a slight flattening 
of the W -pattern due to the somewhat decreased width of the outer 
section of the crowns. 
Genus PLECOTUS Geoffroy. 
1813. Plecotus Geoffroy, Descr. cle l’Egypte, II, p. 112. 
1816. Macrotus Leach, Catal. Spec. Indig. Mamm. and Birds Brit. Mus. 
(Willughby Society reprint, 1882), p. 1. Nomen nudum. The ‘Euro- 
pean Longear, Macrotus europwus .’ 
1878. Plecotus Dobson, Catal. Chiropt. Brit. Mus., p. 177 (part). 
T ype-species. — V espertilio auritus Linnaeus. 
Geographic distribution. — Temperate Europe, Asia, and northern 
Africa. 
Number of forms. — Only the type species is at present definitely 
known. 
Characters. — Dental formula: 
-2 3. 1.-2-4567 .2-2 1-1 2-2 3-3 
1 2 3. 1. - 2 3 4 5 6 3 - 3’ 6 ‘ 1 - V pm 3 - 3 ’ m 3 - 3~~ 36 ' 
Upper incisors well devoloped, each with a distinct secondary cusp, 
the inner tooth much smaller than the outer, and separated from 
canine by a space about equal to its diameter; lower incisors sub- 
equal, trifid, the crowns increasing in size from first to third, and 
forming a continuous, strongly convex row between canines. Upper 
canines rather small and weak, but not peculiar in form; lower 
canine with cingulum produced into a distinct though small anterior 
basal cusp. Cheek teeth normal, though rather small ; anterior upper 
premolar (pm 2 ) in contact with canine, but separated from large 
premolar (pm 4 ) by a narrow space; posterior premolar with distinct 
though small inner cusp; upper molars short on inner side, the 
spaces between the crowns unusually large ; m 1 and m 2 with no trace 
of hypocone ; m 3 with crown area about half that of m 2 , its metacone 
and third commissure small but distinct; lower molars with all the 
