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 bullae 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 H. 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, III, 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. Euderm,a Miller, Proc. Biol. Soc. Washington, XVI, p. 165, Novem- 

 ber 30, 1903. 

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