238 ORYZOMYS. 
Measurements. Total length, 255; tail vertebre, 141; hind 
foot, 29.5. 
217. chapmani (Oryzomys), Thomas, Ann. Mag. Nat. Hist., 7th 
Ser., I, 1898, p. 179. 
CHAPMAN’S Rice Rat. 
Type locality. Jalapa, State of Vera Cruz, Mexico. 
Geogr. Distr. State of Vera Cruz, Mexico. 
Genl. Char. Size small. Skull small; nasals narrow posteriorly; 
palatal foramina reaching nearly to anterior margin of the first upper 
molar. 
Color. Upper parts dark fulvous and black, blacker on back; 
beneath whitish, strongly suffused with slate; ears shining black; 
wrists and ankles suffused with smoky brown; tail bicolor, blackish 
above, paler below. 
Measurements. Total length, 121; tail vertebre, 116; hind foot, 
24; ear, 19. Skull: basal length, 21.6; basilar length, 19.8; greatest 
breadth, 13.8; interorbital constriction, 4.3; length of nasals, 10.4; 
breadth across squamosals, 11.4; palatal length, 11.5; length of 
upper molar series, 3.7. 
a.—caudatus (Oryzomys), Merr., Proc. Wash. Acad. Scien., 111, 
TOOL, D260. 
LONG-TAILED Rice Rat. 
Type locality. Comaltepec, State of Oaxaca, Mexico. 
Genl. Char. ‘‘Similar to O.chapmant, but larger, tail much 
longer; color slightly darker. Skull larger and heavier, with longer 
rostrum and broader nasals.’”’ (Merr., 1. c.) 
Color. Above dark fulvous and black, darkest on dorsal region; 
sides paler; under parts grayish white; tail above blackish brown, 
beneath paler, becoming grayish towards base; hands and feet flesh 
color; ears black. 
Measurements. Total length, 257; tail vertebre, 141; hind 
foot, 30. 
b.—dilutior (Oryzomys), Merr., Proc. Wash. Acad. Scien., 111, 
IQOI, p. 290. 
PaLE Rice Rat. 
Type locality. WHuauchinango, State of Puebla, Mexico. 
Genl. Char: “Similar to O. chapmani, but slightly paler; hind 
foot longer. Rostrum and nasals broader; rostrum more swollen at 
base; anterior root of zygoma heavier.”’ 
Color. Above rufous and black, darkest on dorsal line; sides 
inclining to yellowish brown; under parts white, tinged with buff; 
