234 ORYZOMYS. 
under surface; hind feet very long; soles naked, with six tubercles, 
all very small except the posterior, which is very long and narrow; 
upper margin of the orbit raised into a compressed crest, as in Sig- 
modon.”’ (Baird, 1. c.) 
KEY TOsEHE, SPECIES: 
A. Fur coarse; tail longer than head and body; 
hind feet very long. ‘“‘ Upper margin of 
orbit raised into a compressed crest.’ 
a. Under parts white. PAGE 
a.’ Above yellowish fulvous and black......... O. nelsont 235 
b.’ Above ochraceous and black. 
a.’’ Tail above dusky, whitish below....... O. albiventer 236 
b.” Tail above brown, paler brown 
bemedthiys ie. me vie See ca eet eee O. crinttus aztecus 245 
Cy “Above ochraceous ful yous* 5-7 eee O. yucatanensis 236 
b. Under parts grayish white. 
a.’ Above tawny ochraceous lined with 
Dlacle 25 sine Sea e.d cane ce toon ae eee O. panamensis 241 
b.’ Above mottled blackish brown.......... O. talamance 241 
ce, Above rusty brown and black) 2.2.9 see O. alfart 242 
c. Under parts whitish, or tinged with salmon 
or buff. 
ay -Above paleverayishio. a. 592 eee O. peninsule 236 
by Above reddish: brown and black. 75. 45-24c O. couest 236 
c. Above mixed deep rufous and black. _. 2. O. palatinus 237 
di’ Above dark rufous browne. 6 ee O. hylocetes 237 
e’ Above grizzled fulvous and black-.5-. 558 O. rhabdops 237 
f.’. Above dark fulvous and black, small..... O. chapmant 238 
g.’ Above dark fulvous and black, large....O. c. caudatus 238 
h.’ Above fulvous and black, paler.......... O. c. dilutior 238 
i; Above blackish and fulvous? : 495.40. % O. c. saturatior 239 
jc -bDoOve Chestnut orowimlsa 5. .n sate oe eee O. bullert 239 
kt Above “deep dull fulvous’: 22.22 9. eee O. rufus 239 
1’ Above bright fulvous; beneath tinged 
Wri, Tanya ss ug 2 ksi he A ene O. fulgens 240 
m.’ Above dark fulvous; under parts grayish 
WCE Wiser ht oh oe aS ok Ree ee O. molestus 240 
n.’ Above pale fulvous and black......... O. zygomaticus 241 
6./ “Above srayish ‘bistre® . o... vee ws at se ae O. cozumele 241 
d. Under parts buffy white. 
a.’ Above fulvous brown lined with black...O. mexicanus 242 
