THE BATS OF THE GENUS RIONOPHVLLUS 35 



^leasurements of skull of tA'pe : Greatest length 19.6; basal length 

 iS ; basilar length 16 ; zygomatic breadth S.S ; least interorbital breadth 

 4; mastoid breadth 8.8; greatest breadth of braincase 8.4; fronto- 

 palatal depth at middle of molar series 2 ; depth of brain case 7.6; 

 maxillary toothrow (exclusive of incisors) 7; mandible 12.8; man- 

 dibular toothrow (exclusive of incisors) *]. 



1 ccth. — Teeth as in J/. red??iani except that the gap in toothrow 

 in front of posterior premolar is greatly reduced, and in the lower jaw 

 nearly obliterated. Second upper premolar with well developed 

 postero-internal lobe. First lower premolar slightly shorter than second 

 or third, and conspicuously less narrow. Its main axis is set obliquely 

 to that of the other premolars and its posterior border is noticeably 

 imbricated over outer edge of second premolar. 



Measuretnents. — For measurements of Alonophyllus portoricensis 

 see table, page 38. 



Specimens examined. — Six, all from the type locality. 



Rejnarks. — Monophylhis portoricensis is the smallest of the four 

 species thus far known. It is further distinguished by the form of the 

 posterior premolar. 



MONOPHYLLUS PLETHODON sp. nov. 



Type. — Adult male (in alcohol) no. 101530, United States National 

 Museum, collected in St. Michaels Parish, Barbados, August i, 1899, 

 by P. McDonough. 



Gejteral characters. — See synopsis. 



Ears. — The ears are essentially as in M. redmani though some- 

 what broader relatively to their length. Inner surface without cross 

 ridges. Tragus as in M. portoricensis. 



Muzzle and chin. — Noseleaf like that of j\f. portoricensis, but with 

 upright portion even broader and more bluntly pointed. Groove in 

 chin broader and shallower than in the Porto Rican species. 



Metnbranes., feet and tail as in ]\I. redma7ii. 



Fur and color. — Fur similar to that of AI. redmani in both quality 

 and distribution. Color of type after five months' immersion in 

 alcohol, broccoli brown slightly paler below. 



Skull. — The skull of the type specimen has been injured, though 

 not sufficiently to obscure its essential characters. In size it closely 

 agrees with that of M. clinedaphus., but in form it suggests that of 

 M. portoricensis. Its peculiarities are in some respects carried even 

 further than in the latter, as the rostrum though deeper is relatively 

 narrower, the palate is more arched, and the canines actuall}' closer 



