70 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



While the sheets were passing through the press the Ibnowiiig addi- 

 tions liave been made to my study of Antrozom and its allies, Dd.syp- 

 term, Corynorhinm, and Nyvtophilus. In Antrosoiis theparaconids and 

 metaconids are indistinctly defined and much crowded; in Dosypte- 

 rus they are well defined and separated from each other, as is the 

 case in the liimily. Antrozotis differs from DaKijpterns in the presence 

 of a broad, tlange-like epicondyle; in the simple (nonbifld) coracoid 

 process; in the smaller pisiform bone, which shows no disposition to be 

 prolonged downward along the shaft of the fifth metacarpal bone; in 

 the fifth metacarpal bone being almost the length of the fourth; in the 

 greater trochanter being broad, and not deflected backward; and in the 

 outer femoral condyle being smaller than the inner. The first phalanx, 

 respectively, of the second, third, fourth, and fifth toes are disposed to 

 be dorsitiexed on the metatarsus— a character apt to be repeated in all 

 scurrying forms. I say apt to be repeated, for it is an adaptive char- 

 acter and due to muscle traction. The reader is referred to the figure 

 of AdeJonycterlsfmcus in illustration of the shape taken by the toes 

 when the animal lies prone. This position is sometimes also assumed 

 in specimens preserved in strong alcohol. The absence of such a dis- 

 position in Con/norhUius and Dasypterus is in consonance with other 

 characters, nan'iely, that in these genera the foot is adapted to hanging 

 rather than to scurrying, and that both genera are of the broad- 

 winged parachuted type of flight rather than of the narrower-winged 

 zigzag-flying type. One notes, therefore, without surprise that the 

 third^finger, both in Corynorhinus and Dasynterus, is longer than in 

 Antrozous. 



In Nyctophilus it is seen that the inner condyle of the fenuir is 

 smaller, and the greater trochanter is deflected backward— the last 

 character especially being best developed in parachuted types. 



The union of gland clumps back of the nose-leaf in Antrozons is in 

 evidence of a disposition seen in Bmehyphylla and Fhyllonycteris. So 

 far as it goes, it indicates an approximation of the genus to the phyl- 



lostomines. 



Peters (SB. Akad. Berlin, 1882, 087) places Antrozons and mjctophilus 

 in association with Khinophylla and Meyadermn {!). It is remarkable 

 that Macrotus should also have been placed in a similar alliance. (See 

 this genus.) I have had no means of instituting comparisons with either 

 of the forms last named. 



Genus VESPERTILIO Liunirus. 

 Dental fonnuJa.-Mo\ars^, premolars^, canines J, incisors ^x2 = 48 teeth. 



The genus Vespertilio will be restricted to those bats which, having 

 on each side of the jaw three premolars and three molars, have in ad- 

 dition two upper and three lower incisors. Each spe<'ies possesses an 

 erect, tapering tragus and a marginal external basal lobe to the auricle. 



