1855.] 435 



Length 2-5 in. Ta 1 1, naked part -15. Extent 12-5. Head *S5. Ear3 -425. Oril- 

 lon -2. 



Inhabits the Northern States. 



V. Caroli TemiD. 1. c. p. 23V. 



Dentition as before. 



Hair long dark plumbeous, above tipped with dark chestnut brown, beneath 

 with paler or greyish or yellowish cinereous. Face black, naked with a few coarse 

 hairs. Nose flat, blunt, emarginate, rugou3. Ears short, black, naked except 

 for about one fourth their length from the base on the outer side, emarginate be- 

 hind almost from the tip to the basal lobe. Orillon lanceolate, blunt, rounded 

 at the tip, a very little curved on the posterior edge, straight on the anterior. 

 Membrane black, uaked, except near the body, Interfemoral naked except a few 

 scattered hairs near the body ; including the tail, of which the last joint projects 

 beyond it. 



Length 3-8. Tail 1-5, naked part -1. Extent 11-7. Head -75. Ears -45. Orillon -2. 



Inhabits from New York to Florida. 



This with the four preceding are very nearly related to each other, so much 

 so as to be easily taken the one for the other ; we therefore find thtm all called 

 V. arcuatusof Say or V. caroliniensis of Geoff. St Hilaire, these two being con- 

 sidered identical. They however differ in the shape of the ear and in the oril- 

 lon. These two parts alone I have found in all species of Vespertilionidae to 

 afford unvarying characteristics. 



The fuscas has the ear somewhat triangular, very concave on the outer edge 

 and emarginate near the tip, the orillon acinaciform. 



The carolinensis has the ear hairy for oue half its length, ovate and emarginate 

 on the hinder edge, the orillon is lanceolate and blunt. 



The ursinus, ear oval, eutire ; that is to say not at all emarginate, the orillon 

 acinaciform and obtuse. 



The phaiops, ear somewhat triangular, sinuous or bi-emarginate on the outer 

 edge, orillon oblong, blunt. 



The caroli has the ears ovate, emarginate behind almost from the tip to the 

 base, and the orillon lanceolate, blunt, rounded at the point; a little curved on 

 posterior edge. 



V. pulverulentus Tern. ii. p. 235. V. Audubonii Harlan, Med. & Phys. Re- 

 searches, p. 90. V. noctevagans L. C. olim. 



Dentition the same as in the five preceding species, except that the false molars 

 in the upper jaw are 2-2. the anterior one frequently pressed inward by the pos- 

 terior one ; and in the lower jaw the false molars are 3-3. 



Hair black or very dark brown, generally tipped with white or pale brown, or 

 brownish grey in rather a scattering maDner. Face somewhat hairy, nose blunt 

 emarginate; fore part of the throat with a large wart. Ears moderate, ovate, 

 blunt, the lower half covered with hair, granulate within the outer edge which 

 is somewhat revolute and entire, anterior part of the helix highly developed, 

 prominent and straight, forming a winged appendage near the head. Orillon 

 short, cubiform, blunt, membrane naked black or dusky, interfemoral including 

 the tail, except the last and one half of the penultimate joint, thinly covered for 

 one half its length with long fine hairs like those of the body tipped very slightly 

 with greyish, the under side is furnished with distant hairs disposed in lines. 



Inhabits from New York to Georgia. 



This species has the head of a Noctuloid and the teeth differing from all the 

 others. Is sometimes found entirely black. 



V. subulatus Say. Long's Expedition, vol. ii. p. 65. 



Dentition. Upper jaw, incisors 2-2 distant by pairs, the anterior larger and 

 emarginate, false molars 3-3 anterior one small, intermediate one minute and 

 the posterior large. Molars as in all the preceding species. The teeth in the 

 lower jaw are also the same except that there are 3 false molars on each side, 

 the two anterior of which are not half the length of the posterior. 



