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. 
SnUfaiXLily NYCTOPHILIN^]. 
1865. Nyctophili Peters, Monatsber. k. preuss. Akad. Wissensch., Berlin, 
p. 524 ( Nyctophilus and Antrozous), 
1866. Nyctophilina Gray, Ann. and Mag. Nat. Hist., 3d ser., XVII, p. 91, 
February, 1866. ( Nyctophilus and Antrozous.) 
1878. Plecoti Dobson, Catal. Ckiropt. Brit. Mus., p. 168 (part). 
1891. Vespertilionidce (part: Plecotine division, part) Flower and Lydek- 
ker, Mammals living and extinct, p. 660. 
1897. Antrozoince Miller, North American Fauna, No. 13, p. 41, October 
16, 1897. Antrozous 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 Fiver to central Mexico. 
Characters . — Differs from the Vespertilioninae 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 
Antrozous among the Plecotine bats, Peters had twelve years pre- 
viously expressed the opinion that their relationships are elsewhere. 
By Harrison Allen a they were regarded as distantly allied, Nycto- 
a Monogr. Bats N. Amer. (1893), p. 65, March 14, 1894. 
