250 ORYZOMYS. MOSCHOPHOROMYS. 
AcTIVE Rice Rat. 
Type locality. Boquete, Chiriqui, Panama. Altitude, 4,000 feet. 
Genl. Char. Like O. costaricensis, but larger; color darker. In- 
cisors orange. 
Color. Above bright yellowish red brown; dorsal region darker; 
sides of head and body and rump orange rufous; chin and under sides 
of neck whitish; rest of under parts ochraceous buff; hands and feet 
yellowish white; tail above dusky, beneath grayish; ears dark brown. 
Measurements. Total length, 205-235; tail vertebra, 115-130; 
hind foot, 24; ear, 13. Skull: basal length, 20.2; occipito-nasal 
length, 24.4; zygomatic width, 12.6; mastoid width, 11; interorbital 
width, 3.4; length of nasals, 9; upper molar series, 2.8; length of 
single half of mandible, 12.4. (Bangs, 1. c.) 
49. Moschophoromys. 
Ls ie =" 6: 
Moschophoromys, Elliot, Pub. Field Columb. Mus., 111, 1904, p. 111. 
Type Mus desmaresti Fischer. 
Megalomys Trouess., Le Naturaliste, No. 45, 1881, p. 5. Jd. Ann. 
Scien. Nat., Zodl., x1x, No. 5, 1885, p. 13, pl. r. (mec Launil- 
lard, Paleont.) 
Moschomys Trouess., Ann. Mag. Nat. Hist., 7th Ser., x1, 1903, p. 
387. (nec Billberg, 1828, Microtine.) 
Form rat-like; tail long, scaly; outer finger with a flat nail; hind 
feet long, stout, without webs between the toes, nails curved; sole 
tubercles, six. Skull very broad between orbits; supraorbital crest 
well developed; molars of moderate size. 
KEY TO-THE SPPCIES: PAGE 
Size lange, belly whitest 3:3. 2.26 sees .M. desmarestt 250 
Size. smaller, belly browit-c:.: 255-1408). chota epee ae M. lucie 251 
243. desmaresti (Mus), Fischer, Syn. Mamm., 1829, p. 316. 
pilorides Desm., Dict. Scien. Nat., xLvi, 1826, p. 483. (nec 
Pallas ex Ceylon.) Jd. Trouess., Ann. Scien. Nat., Zodl., x1x, 
No. 5, 1885, p. 13, pl. 1. Ex Antilles francaises. (nec Pall.) 
Biack Rice Rat. 
Type locality. Island of Martinique. 
Genl. Char. Size and shape similar to those of Mus norvegicus. 
Color. Shining black; chin, throat, belly, and base of tail white. 
Measurements. Skull: occipito-nasal length, 62; length of nasals, 
24; length of incisive foramina, 9.2; mastoid breadth, 21; length of 
molar series, 9; posterior edge of foramen magnum to tip of nasals, 
62; posterior edge of interparietal to tip of nasals, 61.5; width of brain- 
