THE FAMILIES AND GENERA OF BATS. - 
225 
cusps present and well developed, the protoconid noticeably higher 
than the hypoconid. Skull with large, elongate and rounded brain 
case, but with rostrum slender and reduced, its upper surface, how- 
ever, of the normal, laterally convex form; lachrymal ridges well de- 
veloped; audital bullse large, rounded, their greatest diameter equal 
to about three times the distance between them. Ears very large, 
much longer than head, joined across forehead; nostrils opening 
upward, their orifice continued backward by a slit-like prolongation, 
the warty outgrowths on muzzle not especially prominent. 
Species examined. — Pleeotus auritus (Linnaeus). 
Genus CORYNORHINUS H.Allen. 
1831. Pleeotus Le Conte, McMurtrie’s Cuvier, Animal Kingdom, I, p. 431 
(part, see p. 84). 
1864. Synotus H. Allen, Monogr. Bats N. Amer., p. 62 (not of Keyserling 
and Blasius, 1839). 
1865. Corynorhinus H. Allen, Proc. Acad. Nat. Sci. Philadelphia, p. 173. 
1865. Corynorhynchus Peters, Monatsber. k. preuss. Akad. Wissensch., 
Berlin, p. 524, October, 1865. 
1878. Corynorhinus Dobson, Catal. Chiropt. Brit. Mus., p. 180 (subgenus of 
Pleeotus ) . 
1894. Corynorhinus Cl. Allen, Monogr. Bats N. Amer. (1893), p. 53, March 
14, 1904 ( genus ) . 
1897. Corynorhinus Miller, North American Fauna, No. 13, p. 49. 
Type-species. — Pleeotus macrotis Le Conte. 
Geographic distribution. — Warmer portions of North America, 
from southern British Columbia and the southeastern United States 
to southern Mexico. 
Number of forms. — Three forms are currently recognized. 
Characters . — Externally like Pleeotus , but glandular masses on 
muzzle rising high above nostrils; skull differing from that of 
Pleeotus in the smoothly rounded lachrymal region; teeth as in 
Pleeotus. 
Species examined. — I have examined all the known forms. 
Remarks. — The great development of the glandular masses on muz- 
zle, and the absence of the distinct lachrymal ridge, distinguish this 
genus sufficiently from Pleeotus. 
Genus EUDERMA H. Allen. 
1891. Histiotus J. A. Allen, Bull. Amer. Mus. Nat. Hist., Ill, p. 195 (not 
of Gervais, 1855). 
1892. Euderma H. Allen, Proc. Acad. Nat. Sci. Philadelphia, 1891, p. 467, 
January 12, 1892. 
1894. Euderma H. Allen, Monogr. Bats N. Amer. (1893), p. 60, March 14, 
1894. 
1897. Euderma Miller, North Amer. Fauna, No. 13, p. 46, October 16, 1897. 
1903. Euderma Miller, Proc. Biol. Soc. Washington, XVI, p. 165, Novem- 
ber 30, 1903. 
25733— No. 57—07 m — — 
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