104 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



In this species of Mr. True, the short ear, with its sharply concave 

 outer margin, the short nonerenulate tragus, the dark color of fur on 

 the under surface of the body, the long tibia, with triangular shape to 

 the interfermoral membrane below the line of the ankles, separate this 

 form from other bats which have been collected in the region of the 

 northwest. If other examples sustain the peculiarities, V. lomjicrns 

 is undoubtedly a distinct species. It is likely, however, to prove to be 

 a variant of the eastern forms modified by migration to the north and 

 west. In the event of this proving to be the case, it becomes a sub- 

 species of Y. gryphiis. V. longicrvs, while a member of the humid coast 

 line of the west coast of North America, is unlike other individuals which 

 have been collected from the same region. The peculiar excavation of 

 the outer border of the auricle and the length of the tibia have not 

 been repeated in other specimens. 



Xote on YespertUio suhulatus, Say.* — Attempts to rehabilitate T". suh- 

 uJafus, so as to admit it in the group of western forms, has proved to 

 be as difticult as is the case for all the North American bats where the 

 tyjjes are unknown. This is especially true of species described in the 

 first half of the i)resent century. To make the admission valid it is 

 necessary that Say's descrix)tion vshould answer to the descriptions 

 of V. albescens, V. nitidus, or one of the subspecies of these forms. The 

 reader must judge for himself with what degree of justice any of the 

 names of the herewith defined forms, either reestablished by acquaint- 

 ance with types or secured by detailed descriiJtion at the hands of accom- 

 plished zoologists, should be put aside in order to restore a form which 

 has been imperfectly described (see p. 187) fi-om a single immature 

 specimen. 



Geiins LASIONYCTERIS Peters. 

 Lastonyctiriti Peters, MB. Akad. Berlin, 18G5, 648. 

 Vesperidcs Coues .aud Yarrow, Wlieeler's Exped., ZoiiL, 1875. 



Diagnosis. — Ears with whitish internal basal lobe; outer border and 

 outer basal parts with membranous flange. Tragus of i)eculiar shape, 

 short, blunt, with straight inner and convex outer border. Face hairy. 

 Wings to base of toes; no cidcaral lobe or tip; tip of tail exserted. 

 Foot and thumb of one length and a little less than oue-fiftli as long as 

 the forearm. Hair dark, plumbeous or blackish, with tips coiispicnously 

 dashed with gray or Avhite. Dorsal four-fifths of iiiterfemoral mem- 

 brane with numbers of minute Avarts arranged transversely and fur- 

 nished with a sparse growth of hair. The first phalanx in the third, 

 fourth, and fifth fingers longer than the second. 



o 9 1'^ 



Dental formula — molars , premolars^, cauines , incisors " x "^^^ ^^ teetli. 

 The manal formula is as follows: 



Millimeters. 



First interspace 1 



Second insterspace 4 



Third interspace 25 



Forearm 37-38 



* For literature of I', suhulatiis, svep. 76. 



