234 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



Characters. — Like Kerivoula, but with upper canine strongly com- 

 pressed, the shaft with deep longitudinal groove on outer side, and 

 with conspicuous posterior cutting edge, its length so increased that 

 the point extends noticeably beyond exposed portion of lower canine 

 when jaws are closed ; lower incisors imbricated, the crown relatively 

 longer than in Kerivoula, that of inner tooth with four distinct 

 cusps; lower premolars with crowns longer than wide, their shafts 

 with well developed anterior and posterior cutting edges ; skull with 

 braincase so elevated anteriorly that the highest region is at middle 

 instead of in occipital region; anterior portion of rostrum broader 

 than in Kerivoula, the width of the nares rather greater than their 

 length; palatal emargination distinctively broader than deep. Ex- 

 ternally as in Kerivoula, but lower lip with a distinct though minute 

 pocket to receive tip of elongated upper canine. 



Species examined. — Phoniscus atrox Miller. 



Remarks. — The greatly increased size and peculiar shape of the 

 upper canine, and the four-cusped inner mandibular incisors distin- 

 guish this genus sufficiently from Kerivoula. But the modification 

 is not confined to these teeth, as the premolars both above and below 

 have become more pointed and trenchant, and the whole anterior 

 portion of the rostrum is strengthened. Contrary to what might 

 be expected, the lower canine remains unchanged. Externally the 

 animal is quite as in Kerivoula, except for the pockets in the inner 

 side of the lower lip, in which the extremities of the upper canines 

 are sheathed. 



Subfamily NYCTOPHILIN^. 



1865. Nyctophili Peters, Monatsber. k. preuss. Akad. Wissensch., Berlin, 

 p. 524 (Nyctophilus and Antrosous). 



1866. Nyctophilia Gray, Ann. and Mag. Nat. Hist., 3d ser., XVII, p. 91, 

 February, 1866. J,Nyctophilus and A ntrozous.) 



1878. Plecoti Dobson, Catal. Chiropt. Brit. Mus., p. 168 (part). 



1891. Vespertilionida (part: Plecotine division, part) Flower and Lydek- 



ker, Mammals living and extinct, p. 660. 

 1897. Antrozoinm Miller, North American Fauna, No. 13, p. 41, October 



16, 1897. Antroeous only. 



Geographic distribution. — From Timor to the Fiji Islands and 

 Tasmania; warmer parts of western North America, from Texas to 

 the Pacific coast and from the Columbia River to central Mexico. 



Characters. — Differs from the Vespertilioninse in the abruptly 

 truncate muzzle, on the anterior face of which the nostrils open for- 

 ward beneath a distinct horseshoe-shaped ridge or small noseleaf. 



Remarks. — Though Dobson placed the genera Nyctophilus and 

 Antrosous among the Plecotine bats, Peters had twelve years pre- 

 viously expressed the opinion that their relationships are elsewhere. 

 By Harrison Allen « they were regarded as distantly allied, Nycto- 



"Monogr. Bats N. Amer. (1893), p. 65, March 14, 1894. 



