MOLOSBID^] 273 



Family Molossidse. 



Upper incisors large, separated by a vacant space in the mid- 

 dle in some species, not separate in others; molars with distinct 

 W-shaped cusps; wings narrow; terminal third or half of tail 

 vertebrae free and projecting beyond the narrow interfemoral 

 membrane; ears medium or large, usually separated at base; 

 tragus more or less developed; no nose leaf; scales on hairs ar- 

 ranged in belts. 



This family is principally tropical or su]>tropical in distribu- 

 tion. It contains half a do.zen genera and about fifty species. 



Genus Nyctinomops Miller. (Night — habitation — like.) 

 Size medium; a space between upper incisors; first upper pre- 

 molar very small ; membranes not furred ; lips large and thick. 



Dental formula, I, i — 2 or i — 3; C, i — i ; P, 2 — 2; M. 3 — 3 

 X2^30 or 32. 



Nyctinomops mohavensis Merriam. (Of Mohave.) 



MOHAVE BAT. 



First upper premolar minute; third lower incisor minute, 

 sometimes lacking in adult or aged individuals; front border of 



Mohave Bat. 



ear with about six wart-like small projections; numerous black 

 spines scattered over the face and chin ; lips crimped, forming per- 

 pendicular wrinkles ; ears apparently connected at bases, but usu- 

 ally not really united; tragus small; free part of tail about equal 



