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NORTH AMERICAN FAUNA. 



JSf. liumeralis Eaf. and N. tesselatus Eaf. Nothing in the description^ 

 indicates which of these the author considered as the type. Nycticeius 

 tesselatus Raf. is Lasiurus horeaUs (Miiller), and JV. Ivmneralis may with 

 some degree of probability be identified with the small brown bat more 

 generally known as Nycticejus crepuscularis Le Conte.^ There is cer 

 tainly nothing in the diagnosis of* the genus or in the description of 

 Yespertilio liumeralis previously published in the American Monthly 

 Magazine that precludes this possibility, while the size, the number of 

 incisors, aud the naked uropatagium point directly toward it. As 

 horealis was removed to the genus Lasiurus by Gray in 1838, liumeralis 

 becomes the type of Nycticeiiis. The orthography of this name has had 

 several emendations, as JSfycticeus, Nycticejus^ Nycticea^ and Nycticeyx. 



Nyctilestes Marsh, 1872 (Amer. Jourii. Sci. & Arts, 3d ser., lY, j). 

 215), is a fossil genus based on part of a lower jaw and molars from 

 Eocene or Lower Miocene strata near Henrys Fork, Wyoming. The 

 remains present no characters to distinguish them generically from 

 Vespertilio. Only one si)ecies, NyctUestes serotinus^ has been described. 



Nyctitherium Marsh, 1872 (Amer. Journ. Sci. *& Arts, 3d ser., IV. p. 

 127), is a genus based on the fragments of two lower jaws found with 

 teeth in place, from Tertiary strata at Grizzly Buttes, Wyoming. The 

 original description indicates no characters by whi(;h these teeth may be 

 distinguished from those of small species of Fipistrellus or Vespertilio. 



Nystactes Kaup, 1829 (Skizzirte Entw.-Gesch. u. Natiirl. Syst. der 

 Europ. Thierw., Ister Theil, p. 108), based on Yespertilio heclisteinii 

 Leisler is strictly synonymous with the same author's Myotis? 



Pachyotus Gray, 1831 (Zool. Misc., No. 1, p. 38), was first used as the 

 name for a genus made by the combination of Nycticeius and Scotoplii- 

 lus. Later (Mag. Zool. & Bot., II, p. 498, 1838) Gray transferred it to 

 Yespertilio villosissimus Geoffroy in a subgeneric sense. The name is 

 of course untenable.* 



Fipistrellus Kaup, 1829 (Skizzirte Entw.-Gesch. u. jSTatiirl. Syst. der 

 Europ. Thierw., Ister Theil, p. 98). This name was based on Yespertilio 

 pipistrellus Schreber, a species strictly congeneric with the 'Yesperugo 



^2. NYCTICEIUS. (Chauve-souris.) Diftere du genre pr6c6deiit \^Hypexodon'] par 

 2 incisives snperieures s^parees par un grand intervalle, accolees anx canines et a 

 creuelures aignes, 6 incisives iuf^rieures tronqii^es, point de verrues anx canines. — 

 Ce genre contient an moins 2 especes, N. humeralis et N. tesselatus, que j'ai deja 

 d6crits dans V American Monthly Magazine, sous la denomination generique Vesijertilio, 

 avec plusieurs autres nouvelles especes de ces con trees. 



'See Thomas, Ann. & Mag. Nat. Hist., 1891, 528. 



•'Kaup says : " Fledermliiise mit sehr langen getrennten Ohren, langem zugespitzem 

 Ohrendeckel, 38 Zahuen uud spitzmausalinlichem Riissel." 



^The original reference is as follows: ''The bats, the Vespertiliones of Geoffroy, 

 might for convenience he divided into three genera, the true hats, Vespertilio, with 

 thin ears and membranes and a hairy face, the Pachyotus, with thick ears and mem- 

 branes and bald swollen cheeks, including the genera Nycticejus and Scotophilus, and 

 the hairy-tailed species of America (Lasiurus) J' 



