238 ORYZOMYS. 
Measurements. Total length, 255; tail vertebrz, 141; hind 
fOOt, 20.5. 
217. chapmani (Oryzomys), Thomas, Ann. Mag. Nat. Hist., 7th 
Ser. 1, L608, p. £70: 
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, 
LOGE, Ps 2oo. 
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 vertebrae, 141; hind 
foot, 30. 
b.—dilutior (Oryzomys), Merr., Proc. Wash. Acad. Scien., Il, 
TOQOU, ps 290: 
PaLE Rice Rat. 
Type locality. Huauchinango, State of Puebla, Mexico. 
Genl. Char. ‘“‘Similar to O. chapmant, 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; 
