PROCEEDINQS 



WASHINGTON ACADEMY OF SCIENCES 



Vol. II, pp. 31-38. M^^^" 30, 1900- 



THE BATS OF THE GENUS MONOPHYLLUS. 



By Gerrit S. Miller, Jr. 



Hitherto Mono-phyllus has been regarded as a monotypic 

 genus, with M. redmant of Jamaica, and perhaps Cuba also, as 

 its only representative. Material in the United States National 

 Museum, though throwing no light on the question of the identity 

 of the Cuban bat with that from Jamaica, shows that the genus 

 contains at least three additional species, one from Porto Rico, 

 one from Barbados and a third from an unknown locality. 

 The four may be distinguished from each other as follows : 



Synopsis of the Species of Monophyllus. 

 Size small, forearm about 36, greatest length of skull less than 20; 

 second upper premolar with well developed postero-internal lobe. 



M. portoricensis. 

 Size large, forearm about 40, greatest length of skull more than 20 ; sec- 

 ond upper premolar with postero-internal lobe rudimentary or 



absent. 

 Second lower premolar shorter than first and in contact with third ; 



no space between upper premolars M. flethodon. 



Second lower premolar longer than first and not in contact with 



third ; a space between upper premolars. 



Ventral surface of basioccipital (when viewed from under side) 



dipping forward at conspicuous angle (about 32°) with surface 



of presphenoid; bony palate narrow and conspicuously arched. 



M. clinedaphus. 

 Ventral surface of basioccipital (when viewed from under side) 

 dipping forward at inconspicuous angle (about 16°) with sur- 

 face of presphenoid ; bony palate broad and slightly arched. 



M. redmani. 



Proc. Wash. Acad. Sci., April 1900. 3^ 



