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NORTH AMERICAN FAUNA. 



Specimens examinecl. — Total number 72, from tlie following localities: 



Florida: Davenport, 1 (skin); Mullet Lake, 1; Old Town, 3. 

 Louisiana: Lafayette, 2; Houma, 2 (1 skin). 

 Mississippi: Hancock County, 1 (skin). 

 Tamaulipas: Matauioras, 3 (2 skeletons). 



Texas: Brownsville, 57 (2 skins); Padre Island, 1; Cameron County, 1. 



General remarls. — Aside from its generic characters Basypterns 

 intermedius is distinguishable among Korth American bats by its large 

 size, small ears, and yellowish brown color. 



Specimens from Louisiana, Mississippi, and Florida average dis- 

 tinctly smaller than those from Brownsville, Tex. (which are essen- 

 tially topotypes). More extensive material than that now available 

 may show the necessity of recognizing two subspecies, a larger Tamau- 

 lipan (tyi)ical) form, and a smaller Austroriparian form. 



Genus NYCTICEIUS Rafinesque. 



1819. Xycticeiiis Rafinesque, Journ. de Physique, LXXXVHI, June, 1819, p. 417. 



1827. Xycticeus Lesson, Man. de Mamm., p. 98. 



1827. Xycilccjus Temminck, Monograpliies de Mamm., I, p. xviii. 



1830. Xijciiceyjc Wagler, Natlirl. System der Amphibien, p. 13. 



1831. Xyeticea Le Conte, McMurtrie's Cuvier, Animal Kingdom, p. 432. 

 1864. Nycticejus H. Allen. Monogr. N. Am. Bats, p. 11. 



1878. Nycticejus Dobson, Catal. Chiroptera Brit. Mus., p. 266. 

 1893. A'^/cfjce/ws H. Allen, Mouogr. Bats N. Am., p. 131. 



Type species. — NycUcems liumeralis Rafinesque. 



Geographic distribution of type species. — Austral zones in the Eastern 

 United States. 



Geographic distribution of genus, — Austral zones in the Eastern United 

 States. Cuba. 



Generic characters. — Dental formula; 



.1-11-1 1-1 3-3 _ 



t, c, -j^ -j^, pm, 2_2? *^'3_3 — 



upper incisor distinctly separated from canine; lower incisors scarcely 

 crowded; outer lower incisor tricuspidate and not smaller than others; 

 skull low and narrow ; uropatagium furred at extreme base only ; tragus 

 blunt and bent forward; tip of tail free from membrane; mammse, 2. 



The genus Nycticeius as thus defined is peculiar to America, where it 

 is represented by one species. It differs in dental formula from all 

 other genera of American VespertiUonidw except Basypterns and 

 Bhogeessa. From the former it is distinguishable by its differently 

 shaped skull, wide space between upper incisor and canine, and essen- 

 tially naked uropatagium. From Bhogeessa it is separated by details 

 in the structure of teeth and skull, as well as by external characters. 



NYCTICEIUS HUMERALIS Rafinesque. Rafinesque s Bat. 



1818. Vesjyerlilio liumendis Rafinesque, American Monthly Mag., Ill, p. 445. 



1819. Xycticehis liumeralis Rafinesque, Journ. de Physique, LXXXVHI, p. 417. 

 1831. Xyeticea crepuscularis Le Conte, McMurtrie's Cuvier. Animal Kingdom. I, p. 432. 



