THE FAMILIES AND GENEEA OF BATS. 251 



hairs about 10 mm. in length on under side of neck in region of 

 conspicuous gular sac. 



Species examined. — Cheiromeles torquatus Horsfield. 



Remarks. — Although so highly modified externally this genus is 

 typically Molossine in its dental and skeletal characters. The skull, 

 in fact, is less specialized in form than that of Molossus, Platymops, 

 or Molossops, and the only noticeable peculiarity of the teeth is the 

 reduced transverse diameter of the upper molars. This, however, is 

 not accompanied by any modification of the cusps. The upper in- 

 cisors are remarkably like those of Molossus, and the tragus resembles 

 that of the same genus. It is unlikely that this indicates any near 

 relationship, as Molossus is one of the genera with incomplete pre- 

 maxillary, while in Cheiromeles the palatal branch is well developed, 

 so that two palatal foramina are always formed. 



Genus NYCT1NOMUS Geoffroy. 



1813. Nyctinomus Geoffroy, Deser. de l'figypte, II, p. 114 (wgyptiacus).. 

 1821. Nyctinorna Bowdich, Anal. Nat. Class. Mamm., p. 28. 



1821. Nyctinomcti Gray, London Medical Repository, XV, p. 299, April 1, 

 1821. 



1822. Nyctinomia Fleming, Philos. of Zoology, II, p. 178. 



1842. Mops Lesson, Nouv. Tabl. Rfgne Anim., p. 18 (Mops indicus Lesson= 

 •Dysopes mops F. Olivier). 



1S78. 'Nyctinomus Dobson, Catal. Chiropt. Brit. Mus., p. 420 (part). 



1902. Nyctinomops Miller, Proc. Acad. Nat. Sci. Philadelphia, p. 393, Sep- 

 tember 12, 1902 (femorosaccus) . 



Type-species. — Nyctinomus cegyptiacus Geoffroy. 



Geographic distribution. — Warmer portions of both hemispheres, 

 north to southern Europe' and the southern United States, east to the 

 Philippines and Norfolk Island. 



Number of forms. — About 40 species of Nyctinomus are now recog- 

 nized, 16 of which occur in America. 



Characters. — Dental formula : 



-2-. 1.-2-4567 ;l-l or Lll c lzi «2_-_2 3-_3 = 30ora 

 12(3).1.-2=45T7' 2^2° 3-3' C l-l ,/Wl 2-2' m 3-8 



Upper incisors simple, well developed, about half as high as 

 canines, wide apart at base, strongly converging at tip, separated 

 from canine by space about equal to their greatest diameter, shaft 

 narrowing both above and below slightly developed cingulum, its 

 apex blunt. Lower incisors equal, bifid, their crowns in contact with 

 each other .and with canine, and usually somewhat imbricated, the 

 cutting edge about on level with cingulum of canine ; third incisor, 

 when present (N. tceniotis and the N. brasiliensis group), less than 

 half the size of the others, its crown scarcely bifid ; canines strong and 

 well developed, but not peculiar in form, the cingulum distinct, but 



