96 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



The foot was large, equally oDe-half the length of the head; the post- 

 calcaral lobe was absent. The caudal series from rump to ankle 

 a little less than one-half the distance from the ankle to the tip. The 

 length of the forearm ranged from 30""" to 33""". This variety, there- 

 fore, may be accepted as pedomorphic. Immature specimens from 

 Alaska appear to be of this variety. The color of a specimen from 

 Beaverton, Oregon, is dark olive-brown, quite as in Addonf/cteris fuscus 

 with lighter shades anteriorly. Those from British Columbia are much 

 darker, verging from dark gray to brown-gray. 



Two specimens of V. nlyricans^ Xos. 3213 Panama and 4522 n. 1. (Mus. 

 Comp. Zool.), agree with the specimen from the American Museum 

 of Natural History in having the foot 7'""' long. These do not materially 

 differ from two specimens collected by Dr. Benjamin Sharp at Tobago, 

 West Indies, in which the external basal lobe Avas broader than high, 

 the fur black. I regret that the material at my disposal is not of a 

 character Avhich enables me to determine the precise relations obtain- 

 ing between T". nigricans and V. nitidns. The vespertilionine bats of 

 the west coast of the United States closely resemble V. ni{/ricans. I 

 am*not sure but that T". nitidns nuist be accepted as a geogra|)hical 

 variety of this S(mth American form; practically there is no difference 

 between the two varieties excepting tlie shape of the external basal 

 lobe of the ear and the color of the hair of the dorsum, which is darkish 

 gray to black in T^. nigricans and reddish-brown in V. nitidus. 



In a melauic specimen 281).j0, collected by C. 11. Merriam, at Panaca, 

 Kevada, (Collection of Agricultural Department), the leg measured 12"', 

 the forearm 37"', the auricle ]2"', the foot 7'", and the tragus 5"', while 

 the post calcaral lobe was large, and the tail exsert. These proportions 

 are (|uite different from those of the average T". nitidus. 



In the dark sienna (almost black) brown of the back and the scarcely 

 lighter shade of the same color of the chest and abdomen, a specimen 

 collected at Queen Charlotte Island, by JNlr. J. II. Keen, and kindly 

 sent me by Dr. C. H. Merriam, no trace of white color marked the space 

 between the lower jaw. 



In No. 24223 i , Eosebury, Oregon (Collection of Agricultural De- 

 partment), the same deep brown to black colors obtain. The tragus is 

 semipyriform and of the height of the first scallop, which is cons[)icu- 

 ously convex. The interfemoral membrane below the level of the ankles 

 is triangular, with the tip of tail boldly exsert. The forearm is 32"', 

 the thumb 5'", the tibia 15"', the foot 8'", head and trunk 39'", and the 

 tail 32"'. The upper lateral incisor is not parallel to the central. The 

 external basal lobe tends to be broader than high and the space be- 

 neath the lower jaw, while less white than in the more southern ex- 

 amples, was not of the same color as the rest of the fur on the under 

 surface of the body. 



No. 24011 Blue Creek, Washington (Collection of Agricultural De- 

 partment), closely resembles V. nitidus, but is of a uniform black color. 

 The feet and interfemoral membrane are precisely as in the species 



