MILLER AND REHN : NORTH AMERICAN MAMMALS. 89 



1897. [Ti/lo>ni/f<] panamensis Trouessart, Catal. mamm., 



pt. Ill, p. 520. 

 Type locality, — Panama. 



Tylomys vratsoni Tliomas. 



1S99. 2]i/lo)/ti/f< toatsoni Thomas, Ann. and mag. nat. hist., 

 7th ser., iv, p. 278. October, 1899. 



Type locality. — Bogava, Chiriqui, N. W. Panama. Alti- 

 tude, 800 feet. 



Genus HOLOCHILUS Brandt. 



1835. Holodiihis Brandt, Mem. de I'acad. imper. sci. St. 

 Petersbourg, 6th ser., i, p. 428. Type. — Mus {Holochilus) 

 leucogaster Brandt. 



^Holochilus pilorides (Pallas). 



1778. 31>(f< pilorides Pallas, Noy. spec, quadr. glir. ord., p. 

 91. 



1885. Hesperomys pilorides True, Proc. U. S. nat. mus., vii 



(1884), p. 598." 1885. 

 1897, \Holochilus~\ pilorides Trouessabt, Catal. mamm., pt. 



in, p. 520. 

 Type locality, — Island of Martinique, Lesser Antilles. 



Genus SIGMODON Say and Ord. 



1825. Sigmodon Say and Ord, Journ. acad. nat. sci. PhUa., iv, 

 pt. II, p. 352. Type. — ^Sif/modo/t /lisjridas Say and Ord. 



Sigmodon borucae Allen. 



1897. Sigmodon borucae Allen, Bull. Amer. mus. nat. hist., 



IX, p. 40. March 11, 1897. 

 Type locality. — Boruca, Costa Rica. 



