34 MILLER 



First lower premolar shorter than second or third, but relatively less 

 narrow. Its posterior border is scarcely imbricated over anterior ex- 

 tremity of second premolar. 



Measiire7}ients. — For measurements of Mojiophyllus red?natii see 

 table, page 38. 



Specimens examined. — One, from Kingston, Jamaica. 



Remarks. — Monophyllus redtnani is readily distinguishable from 

 the other members of the genus by its large size, heavy rostrum, and 

 nearly flat base of braincase. The peculiarities of the tragus in the only 

 specimen that I have examined may be due to the effect of strong alcohol. 



MONOPHYLLUS FORTORICENSIS sp. nov. 



Type. — Adult male (in alcohol), no. 86261 United States National 

 Museum, collected in a cave near Bayamon, Porto Rico, January 18, 

 1899, by Paul Beckwith. 



General characters. — See synopsis. 



Ears. — The ears are essentially like those of J/, redmani. The 

 tragus, however, is very conspicuously thickened along its anterior 

 border. Inner surface of conch with scarcely a trace of cross striation. 



Muzzle a?id chin. — Noseleaf smaller than in JM. redtnani and less 

 tapering above, the sides not parallel below tip. Groove in chin ap- 

 parently deeper and narrower than in AI. redtJiani. 



jMembranes., feet and tail as in M. redmani. 



Fur and color. — Fur slightly longer than in M. redmani (about 6 

 mm. long on middle of back) but not different in quality or distribution. 



Color of a specimen (topotype) skinned after two months' immer- 

 sion in formalin, seal brown above, broccoli brown below, the ex- 

 treme tips of the hairs grayish. The light tips are conspicuous on 

 the ventral surface, but scarcely noticeable above. 



Skull. — The skull of Monophyllus portoricensis is considerably 

 smaller than that of AI. redmani., and as the reduction in size affects 

 the rostrum relatively more than the braincase the general appearance 

 of the skull is considerably altered. In fact at first glance the skull 

 strongly suggests that of Glossophaga sorici/ia., though it is slightly 

 smaller. The rostrum is very noticeably shorter than the braincase. 

 Its sides are nearly parallel and scarcely divergent at base of canines. 

 The braincase rises above rostrum at a slightly greater angle (about 

 25°) than in Af. redmani. Base of braincase exactly as in M. red- 

 ma?ii^ except tliat median ridge of presphcnoitl is somewhat flattened 

 posteriorly and perfectly continuous with ridge separating basisphe- 

 noid pits. 



