248 PROCEEDINGS OF THE ACADEMY OF 



Upper jaw. Incisors equal ; centrals bifid, laterals unicuspid, intervening 

 space in the mesial line. 



Canines simple. Premolars three in number, anterior ones small. Third 

 large. The remaining molars as usual. 



Lower jaw. Incisors trilobed, excepting those contiguous to the canines, 

 which are quadrilobed. Of the premolars the first is larger than the second ; 

 the third is larger than both. Remaining molars not peculiar. 



In the bat labelled 1745, Gaudaloupe, the second premolar both above and 

 below is so wedged in between the first and third that it is scarcely visible from 

 the outside. 



It bears a strong resemblance to V. mystacinus, Leis. The emarginate ear, 

 elongate tragus, and whiskered lips are seen in both ; but our species is 

 larger than V. mystacinus, while the thumb is smaller ; the tail is shorter, 

 and calcaneum more produced. 



It differs also in color, V. mystacinus being a grayish brown ; V. nitidtis a 

 reddish brown. 



MEASUREMENTS. 



Expanse 8-0 



Height of ear 0*5 



" " tragus 0-3 



Length of forearm 1-3 



" "tibia 0-5 



" " tail 1-1 



" " thumb 0-2 



" foot 0-3 



" " longest finger 0*2 



Habitat. California. 

 No. 1981. Monterey. W. Hatton. 



" 5221665. Fort Steilacoom. Dr. Suckley, U. S. A. 

 " 5231656 " " " " " 



" 5241657 " " 



" 5251658 " " " 



In 1855, Major Le Conte, in the 7th Vol. Proc . Acad. Nat. Sci. p. 437, de- 

 scribed a bat from California under the name, V. pallidus. 



The changes which have taken place in the classification of Cheiroptera of late 

 years and especially the greatly restricted sense in which the genus Vesperti- 

 lio as now received, is sufficient apology for the insertion of this bat under the 

 genus which I am about to propose. 



Antkozous, n. g. Head rather large ; nose high, tapering, narrow ; snout 

 angular, blunt; nostrils apical, outer borders joining above in a' transverse 

 line ; eyes large ; ears longer than head, not joined. Skull long, not de- 

 pressed, slightly crested at posterior part, tapering anteriorly. 



4 12 14 

 Dentition, m -, c- in. -, c -, m-,=28. 



5 1 4 15 



Upper jaw. The sup. incisors large pointed, separated by a narrow space. 

 Canines well developed with a small basal internal cusp. No small premolar 

 posterior to canine, as in Lasiurus ; molars as in that genus. 



Lower jaw. Incisors trilobed, the two centrals placed anteriorly to laterals. 

 Canines with an acute basal cusp which nearly touches the second premolar. 

 The first premolar simple and smaller than the second. Molars not peculiar. 



This genus differs from Vespertilio in the high and slender snout ; the crested 

 and narrow skull ; the elevated broad ears, and in one incisor less in the upper 

 jaw, and two less in the lower. Indeed the latter fact is alone sufficient to 

 separate it, for although the incisors in the upper jaw as a general rule are 

 subject to considerable variation, a departure from the usual number in the 

 lower jaw is a matter of more significance. Antrozous is the only instance in 

 the extensive family of Vespertilionidae of such variation. 



[April, 



