THE BATS OF THE GENUS MONOPIIYI.LUS 33 



Tail. — The tail is about as long as the foot, and a little less than 

 half free from membrane. 



JFur and color. — The fur is loose in texture and very short (scarcely 

 5 mm. on middle of back). It is closely confined to body, scarcely 

 reaching membranes except as stated above. 



Color of a specimen after five years' immersion in alcohol, rather pale 

 Prouts brown above, Isabella color below, the hairs tipped with pale 

 gray. These tips are inconspicuous above but very noticeable below. 



Skull. — The skull of Monophyllus redviani is slender but at the 

 same time rather robustly built, in form almost precisely like that of 

 the somewhat larger Glossonycteris geoffroyi. Rostrum nearly as 

 long as braincase, its sides essentially parallel. It is narrowest just 

 behind canines. A distinct swelling in lachrymal region over each 

 orbit. Antorbital foramen directly above space between premolars, 

 its upper and posterior margins swollen. Zygomata slender, distinctly 

 expanded vertically near anterior and posterior base, the anterior ex- 

 pansion upward, the posterior downward. Braincase slender, con- 

 siderably longer than broad, the forehead rising above rostrum at 

 angle of about 20°. Highest point of braincase over middle of mesen- 

 cephalon. Audital bullae small, the area of each scarcely exceeding 

 that of glenoid surface. That part of base of braincase formed by 

 basioccipital and basisphenoid forms a plane dipping uninterruptedly 

 forward (when skull is viewed with its dorsum down) from anterior 

 lip of foramen magnum to well developed basisphenoid pits at an 

 inconspicuous angle, about 16°, with surface of presphenoid. The 

 entire ventral surface of the presphenoid lies in one plane, broken only 

 by a narrow but well defined median longitudinal ridge which termi- 

 nates posteriorly in a pointed projection lying ventral to the ridge 

 separating basisphenoid pits. 



Measurements of an adult skull ( ^ ) from Kingston, Jamaica : 

 Greatest length 22.4; basal length 21.4; basilar length 19.4; zygo- 

 matic breadth 10; least interorbital breadth 4 ; mastoid breadth 9.8; 

 greatest breadth of braincase 9 ; frontopalatal depth (at middle of 

 molar series) 2.4; depth of braincase 8; maxillary toothrow (exclu- 

 sive of incisors) 8.6; mandible 15.4; mandibular toothrow (exclu- 

 sive of incisors) 9. 



Teeth. — The teeth are small relatively to the size of the skull, 

 though not different in this respect from those of members of related 

 genera. Both upper and lower toothrows are broken by a conspicu- 

 ous gap in front of posterior premolar. Second upper premolar 

 broader posteriorly than anteriorly, but without postero-internal lobe. 



