188 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



along its edge, as well as that of the bi'achial membrane; hair beneath black, the 

 tip yellowish-white; hind feet rather long, a few setie extending over the nails; 

 only a minnte portion of the tail protrudes beyond the membrane. 



Total length, 2 9-10 inches ; tail, 1 1-5 inches. 



Vespertilio arquatns. — Head large; ears rather shorter than the head, wide, and at 

 tip, ronnded, hairy at base, posterior edge with two slight and very obtuse emargi- 

 nations; the anterior base distant from the eye; tragus arquated, obtuse at tip; 

 interfemoral membrane naked, including the tail to one-half of the penultimate 

 joint. Totallength, 5 inches; tail, 1 12 inches; expansion more than 13 inches. 



Resembles V. fascuf: in color, but larger. Ears broader and proportionally shorter, 

 and an arquated tragus curving in an almost luniform manner towiirdsthe anterior 

 portion of tlie ear, like that of J', serotnnis. [Desorijition abbreviated from Say.] 



Council Bluti's (Iowa). Say, Long's Expedition to Rocky Mountains, 1823, I, 167. 



G-. 



Fr. CuviEB.* — Noiiv. Anuales du Museum d'Histoire Naturelle, Paris, 

 1832, 15.t 



1. Vespertilio grijplius. — The head is like that of the A[nrinoi(l group of bats, to 

 the molars projier of which is'united two additional false molars on both sides of 

 either jaw. The ear is emarginatod, and the tragus is knife-shaped. All the superior 

 parts of the body are of a whitish yellow, the inferior parts are gray, but the base 

 of the fur on both sides is of a blackish color. Whiskers are present on each side of 

 the upper lip and on the extremity of th(^ lower jaw. 



Length of body, from the tip of nose to base of tail, 1 inch 9 lines; length of tail, 

 1 inch 7 lines; expanse of wing inembranes, 7 inches 10 lines. 

 Hah. — Environs of New York. (M. Milbert.) 



2. V. Salarii. — The head is like that of the ALurinoid group of bats, to the molars 

 proper of which is united the jiresence of two false molars on both sides of either 

 jaw. The ear is emarginate, and the tragus lanceolate. The superior parts of the 

 body are of a brown chestnut-gray, and the inferior parts a grayish white. There 

 is more of the brown color at the basal portion of fhe fur than at the upper. Whisk- 

 ers are present on the sides of the upper lip and at the extremity of the lower jaw. 



Length of body, from tip of nose to the base of tail, 1 inch 6 lines: length of tail, 1 

 inch 7 lines; expanse of wing membranes, 7 inches 7 lines. 

 ^a&.— Environs of New York. (M. Milbert.) 



3. V. creeks. — The head of the Serotinoid group of bats. No false molars on upper 

 jaw, and one only inferioi-ly; the ear is emarginate, the tragus lanceolate; the up- 

 per parts are of a brown yellow, th(^ inferior parts of a dirty gray; the hairs of all 

 the parts ai'c black at their base. Whiskers are present on the sides of the muzzle 

 and beneath upon the lower jaw. 



Length of body, from tip of nose to the base of the tail, 2 inches; length of tail, 1 

 inch; expanse of wing membranes, 9 inches. 

 Hab. — Georgia. (Maj. Leeonte.) 



4. V. crassits. — The head is like that of the Murincid group of bats. Two false 

 molars on each side of the two jaws; the ears are obtuse, the tragus is lanceolate. 

 All the superior parts of the body of a brown chestnut-gray, and the inferior parts 

 whitish; the fur at its base is darker tinted than its tips. Moustaches are present 

 on the upper liji and upon the lower jaw. 



Length of body, from tip of nose to base of tail, 2 inches; length of tail, 1 inch 8 

 lines; expanse of wing membrances, 8 inches 8 lines. 



* M. Cuvier designated by the term " Murhioid gvoup " those species of Chiroptera 

 since placed under the genus Vespertilio. In the " Serotinoid group " he placed those 

 species now included in Scotophil us. The names are taken respectively from two 

 well-known European species — J', miiriiiiis and V. serotinus. 



t Translation with emendations in "Monograph of Bats of North America," Allen, 

 1864. 



