254 



BULLETIN 57. UNITED STATES NATIONAL MUSEUM. 



Geographic distribution.— Southeastern Africa, Madagascar, Bour- 

 bon, and Mauritius ; also Tropical America (Peru and Cuba). 

 Number of forms.— Eight forms are currently referred to this 



group. 



Characters. - 



-Dental formula: 



_ 2 -. 1.--4567 .1-1 1-1 1 



. j r»»*- — — " — 



12(3). 1.-24567 3-3 



1 1-1 3^3 



.l'?" l 2-2' ra 3-3" 



=30 or 28- 



2 - 2' 1 



Except in the constant absence of 

 the small upper premolar this genus 

 does not differ appreciably from Nyc- 

 tinomus. The ears are usually smaller, 

 however, and are never joined across 

 forehead. The skull of Mormopterus 

 minutus is shown in fig. 44. 



Species examined. — Mormopterus 

 acetabulosus ■ (Demarest), M. alli- 

 oenter ( D o b s o n ) , M. jugularis 

 (Peters), M. kalinowskii (Thomas), 

 and M. minutus (Miller). 



Remarks. — The constant absence of 

 the small upper premolar and the 

 generally smaller size of the ears as 

 compared with those of Nyctinomus 

 seem important enough characters to 



warrant the recognition of this genus. In the two known American 



species there are only 2-2 lower incisor teeth. 



Fig. 44.— Mormopterus minutus. Adult 

 male., Trinidad, Cuba. No. 4915. Amer. 

 Mus. Nat. Hist, x 2}. 



Genus PLATYMOPS Thomas. 



1900. Platymuiis Thomas, Ann. and Mag. Xat. Hist., TtU ser., XVII, p. 499, 

 May, 1900. 



Type-species. — Platymops inacinUluiil Thomas. 

 Geographic distribution. — Northeast Africa (between Adis Ababa 

 and Lake Rudolf). 



Number of forms. — The type is the only species known. 

 Characters. — Dental formula : 



1.-2-4567-1-1 1-1 2-2 3-3 



' i" n 2^2 W 



=30 



12-. -1. -2-4567'2-2"l-r / "" 2-2"" 3-3" 

 Upper incisors bifid, more than half as high as canines, wider apart 

 at base than at tip, separated from canines and from each other by 

 space about equal to their greatest diameter; crown about half as 

 long as high, its breadth at base slightly less than length ; posterior 

 surface of crown rather strongly concave; outer lobe slightly more 

 than half as large as inner, its tip diverging a little outward. Lower 

 incisors subequal, imbricated, forming a continuous, slightly convex 



