250 ORY2OMYS. 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 vertebrae, 115-130; 

 hind foot, 24; ear, 13. Skull: basal length, 20.2; occipito-nasal 

 length, 24.4; zygomatic width, 12.6; mastoid width, n; 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. 



I.S;M.H=,6. 



Moschophoromys, Elliot, Pub. Field Columb. Mus., in, 1904, p. in. 



Type Mus desmaresti Fischer. 



Megalomys Trouess., Le Naturaliste, No. 45, 1 88 1, p. 5. Id. Ann. 

 Scien. Nat., Zool., xix, No. 5, 1885, p. 13, pi. i. (nee Lauril- 

 lard, Paleont.) 

 Moschomys Trouess., Ann. Mag. Nat. Hist., 7th Ser., xi, 1903, p. 



387. (nee Billberg, 1828, Microtinas.) 



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 SPECIES. PAGE 



Size large, belly white M. desmaresti 250 



Size smaller, belly brown M. lucia 251 



243. desmaresti (Mus), Fischer, Syn. Mamm., 1829, p. 316. 



pilorides Desm., Diet. Scien. Nat., XLVI, 1826, p. 483. (nee 

 Pallas ex Ceylon.) Id. Trouess., Ann. Scien. Nat., Zool., xix, 

 No. 5, 1885, p. 13, pi. i. Ex Antilles francaises. (nee Pall.) 

 BLACK 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- 



