218 BULLETIN 57, UNITED STATES NATIONAL MUSEUM. 



G-eographic distribution. — Central and eastern Asia. 



Number of forms. — Only the type species is yet known. 



Characters. — Externally as in Nycticeius except that the fur has a 

 distinct color pattern of white markings on a brown ground. Skull 

 wider and not as deep as that of Nycticeius, the anterior palatal 

 emargination relatively smaller than in any other member of the 

 family, its greatest depth scarcely more than half as great as dis- 

 tance between upper canines. Lachmyral region somewhat expanded, 

 and anterior edge of orbit distinctly beaded and angular. 



Species examined. — Scotomanes ornatus (Blyth). 



Genus RHOGEESSA H. Allen. 



1866. Rhogeessa II. Allen, Proc. Acad. Nat Sci. Philadelphia, p. 285. 

 1873. Rhogoessa Marschall, Nornenclator Zoologicus, Mamin., p. 11. 

 1878. Rhogeessa Dobson, Catal. Chiropt. Brit. Mus., p. 245 (subgenus of 



Vesper ugo) . 

 1894. Rhogeessa H. Allen, Monogr. Bats N. Amer. (1893), p. 132, March 



14, 1894 (genus). 

 1897. Rhogeessa Miller, North American Fauna, No. 13. p. 122, October 



16, 1897 (part). 



Type-species. — Rhogeessa tumida H. Allen. 



Geographic distribution. — Warmer parts of America, north to cen- 

 tral Mexico. 



Number of forms. — Six species of Rhogeessa are currently recog- 

 nized. 



Characters. — Like Nycticeius, but outer lobe of all three lower 

 incisors obsolete and inner lobe practically absent also in the outer 

 tooth, which is thus much reduced in size as compared with the other 

 two, though its cutting edge, formed by the middle lobe, remains in 

 line with the others, and functional. 



Species examined. — Rhogeessa gracilis Miller, R. io Thomas, R. 

 minutilla Miller, R. parvula-H. Allen, R. tumida H. Allen, and R. 

 velilla Thomas. 



Genus B^ODON Miller. 



1897. Rhogeessa Miller, North American Fauna, No. 13, p. 122, October 



16, 1897 (part). 

 1906. Bwodon Miller, Proc. Biol. Soc. Washington, XIX, p. 85, June 4, 



1906. 



Type-species. — Rhogeessa alleni Thomas. 



Geographic distribution. — Jalisco, Mexico. 



Number of forms. — The type is the only species known. 



Characters. — Like Rhogeessa, but with the reduction of the outer 

 lower incisor carried so far that the tooth has become a mere function- 

 less spicule less than one-twentieth as large as the first or second 

 incisor, nearly concealed beneath cingulum of canine. Third upper 

 molar Avith posterior portion slightly more reduced than in Rhogeessa. 



Species examined. — Bwodon alleni (Thomas). 



