1876.] MR. G. E. DOBSON ON THE MOLOSSI. 717 



Premaxillary bones separate in front or conjoined by cartilage 

 only, upper incisors close to the canines by their bases, separate in 

 front, their cusps converging inwards and forwards. 



Range. — Generally distributed throughout the tropical and warmer 

 parts of the temperate zones of both hemispheres. 



In the following analytical table of the species, and in the subse- 

 quent descriptions, reference is often made to the different parts of 

 the ear-conch which are shown and named in the drawing (see 

 p. 716), which represents, in half-shading, the head of Nyctinomus 

 macro t is, Gray. 



Synopsis of the Species. 



o 2 



T. Premolars ^— «• 



a. Integument of the ears thick, opaque ; keel of 



the ear-conch thickened in lower third ; anti- 



tragus separated by a deep notch. 



a' Lips smooth: inner margins of the ears arising 



from the muzzle by distinct points of origin ; 



tragus broad, rounded off above. 



a. Antitragus irregularly quadrate ; 



lower incisors 4 1. 2V. africanus, p. 710. 



b' Lips furrowed by deep vertical wrinkles. 



rt". Ears separate or conjoined at the bases 



of their inner margins only ; tragus 



broad, rounded off above. 



a'". Ears conjoined at the bases of their 



inner margins ; gular sac distinct 



in ($. 



(3. Antitragus obliquely triangular, 



rounded; lower incisors 6 2. N. cestoni, p. 719. 



/'"'. Ears separate ; no gular sac. 

 y. Antitragus half oval. 



a'. Lower incisors 4 3. N. aegyptiacus, p. 721. 



13'. Lower incisors 6 4. N. tragatus, p. 721. 



b". Ears conjoined by a inore or less deep 

 band ; tragus small ; no gular sac. 

 c"'. Ears conjoined at the bases of their 

 inner margins. 

 a. Fur unicoloured ; wings from the 



lower end of the tibia? 5. N. plicatus, p. 721. 



(3. Fur greyish on the surface; wings 



from the middle of the tibire ... 6. N. bivittatus, p. 722. 

 d'". Ears conjoined by a deep band in front, 

 o. The first upper premolar stands in 

 the tooth-row. 

 a'. Lower third of the ear-keel 

 much thickened and flattened 



externally 7. N. brachypterus, p. 722. 



(3'. Lower third of the ear-keel 

 slightly thickened, not flat- 

 tened externally. 



a". Fur of the chest and 

 abdomen uniform in co- 

 lour 8. N. pumilus, p. 723. 



(3". Fur of the lower half 

 of the chest and the ab- 

 domen white 9. N.limbatus, p. 724. 



