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, l. c.) 
KEY TO: THE, 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 | 
DGMEABNS ts rs 7 i eeremedecee ten oe O. crinitus aztecus 245 
ec; Above ochraceous fulvoliss. 2... 6<. os O. yucatanensis 236 
b. Under parts grayish white. 
a.’ Above tawny ochraceous lined with 
BUGIS oe a crt ony d he Ge ee ek, Se eee O. panamensis 241. 
b.’ Above mottled blackish brown.......... O. talamance 241 
Gc, Above rusty brownandpolack>:.2/5 «. vous O. alfart 242 
ec. Under parts whitish, or tinged with salmon 
or buff. 
By Above pale prawish . oc) sec nae kek ee O. peninsule 236 
b.’ Above reddish brown and black.:........... O. couest 236 
c.’ Above mixed deep rufous and black...... O. palatinus 237 
dy Above dark’ rurous brown: i. och te eee O. hylocetes 237 
e.’ Above grizzled fulvous and black......... O. rhabdops 237 
f.’ Above dark fulvous and black, small..... O. chapmant 238 
g.’ Above dark fulvous and black, large....O. ¢. caudatus 238 
h.’ Above fulvous and black, paler.......... O. c. dilutior 238 
i.’ Above blackish and fulvous........... O. c. saturatior 239 
j. Above chestnut brown Js. 9.2... .<<c-s een ee O. bullert 239 
k.’ Above ‘deep. Gull fubvots=*. i: nee ee O. rufus 239 
1.’ Above bright fulvous; beneath tinged 
Wath PAW a/1 5 a5 ae ree eee O. fulgens 240 
m.’ Above dark fulvous; under parts grayish 
WITS oe Rey a Cae ek oe ee O. molestus 240 
n.’ Above pale fulvous and black......... O. zygomaticus 241 
0. Above pragish bistre, nea aes eee O. cozumele 241 
d. Under parts buffy white. 
a.’ Above fulvous brown lined with black. ..O. mexicanus 242 
