MOLOSSID^ 273 



Family Molossidae. 



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 

 vertebras free and projecting beyond the narrow inter femoral 

 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 subtropical in distribu- 

 tion. It contains half a dozen genera and about fifty species. 



Genus Nyctinomops Mili^ER. (Night — habitation — Hke.) 

 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 



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 



