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. — Barhastella barbastellus (Schreber). 



Remarks. — Although differing very notably from the Plecotine 

 Plecotus, Corynorhinus and Euderma in the dental formula, the 

 small audital bullae, and the simple zygoma, Barhastella 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 Geoffrey. 



1813. Plecotus Geoffeoy, Descr. de l'Egypte, II, p. 112. 



1816. Macrotus Leach, Catal. Spec. Indig. Mamra. and Birds Brit Mus. 

 (Wiliugnby Society reprint, 1882), .p. 1. Nomeu nudum. The 'Euro- 

 pean Longear, Macrotus eiiropa us.' 



1878. Plecotus Dobson, Catal. Chiropt. Brit. Mus., p. 177 (part). 



Type-species. — Yespertilio 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 



12 3. 1. -234567*3- 3' c 1 - vP m 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 peouliar 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 x and m * with no trace 

 of hypocone; m !! with crown area about half that of m % its metacone 

 and third commissure small but distinct; lower molars with all the 



