92 Bulletin American Museum of Nattiral History. [Vol. XIII, 



These are slender, curved teeth, two on either side, obliquely in- 

 serted, with the tip strongly curved laterad. As the permanent 

 incisors are already well developed, there are thus six upper in- 

 cisors, arranged in two rows, an outer row of four milk incisors 

 and an inner row of two permanent incisors. 



The skull of Promops affinis, allowing for the immaturity of the 

 specimens, closely resembles, in general form and character of 

 the teeth, that of P. depressus (Ward) from Mexico. The two 

 species are also practically of the same size and proportions, but 

 in color P. affinis is much darker than P. depressus, and has the 

 lower outer lobe of the ear much narrower, and the inflated 

 upper internal border wider. They are obviously closely related 

 forms, but their exact relationship can be determined only on 

 comparison of a larger amount of more strictly comparable 

 material. 



A note by the collector attached to one of the specimens 

 states : " This species congregates in narrow fissures of the coast 

 rocks, just above the surf. When disturbed it crawls deeper into 

 the crevices, but does not take flight (in the daytime) even when 

 a gun is fired into its retreat." 



I take the present opportunity to record what seems to be 

 another undescribed species of Promops, from Peru, received a 

 few years since from Mr. O. T. Baron, and hitherto wrongly 

 identified. 



Promops milleri, sp. nov. 



Molossus nasutus ALLEN, Bull. Am. Mus. Nat. Hist. IX, 1897, 115. (Not 

 M. nasutus of Spix.) 



Type, No. Hfff> $ ad - Guayabamba, Peru (altitude 6000 feet), September 

 24, 1894 ; O. T. Baron. 



Pelage very soft and thick, moderately long. Above dark sooty brown, hairs 

 pale fulvous at extreme base ; below similar but rather paler ; ears and mem- 

 branes black. Distribution of fur on the wing membrane, on the forearm, and 

 between the fingers, much more restricted than in Molossus rufus or P. 

 abrasus, and the naked margin of the outer surface of the ears is much broader. 

 Ears moderate for a Promops, nearly meeting in front but not joined ; tragus 

 small, pointed, broadest at base. Tail extending about half its length beyond 

 the membrane. 



Measurements. Collector's measurements from four fresh specimens : Head 

 and body, 81 ; tail, 46 ; hind foot, 15-16. Measurements of type, from skin : 



