ORYZOMYS. 235 



b/ Above grayish brown heavily lined with PAGE 



black O. m. peragrus 243 



c.' Above grizzled rufous 0. mclanotis 243 



d.' Above ochraceous fulvous, lined with 



black 0. rostratus 243 



e.' Above deep fulvous and black 0. r. megadon 243 



f / Above dark rufous 0. victus 244 



g.' Above russet brown O. devius 244 



e. Under parts buff. 



a/ Above buffy fulvous 0. crinitus 245 



b/ Above tawny rufous 0. tectus 245 



c/ Above mixed fulvous and black. 



a." Size large 0. angusticeps 245 



b." Size smaller 0. goldmani 246 



d/ Above dark brown tinged with yellowish. 



a." Under parts buff 0. jalapce 246 



b." Under parts gray 0. j. apatelius 246 



e/ Above dark fulvous and black 0. f. rufinus 247 



f. Under parts buffy fulvous. 



a/ Above grizzled bistre 0. teapensis 247 



g. Under parts deep buff. 



a/ Above yellowish brown to yellowish 



chestnut O. costaricensis 249 



b/ Above bright yellowish red brown 0. vegetus 249 



h. Under parts yellowish; above rufous, sparsely lined with 



black O. antillarum 247 



i. Under parts ochraceous fulvous; above grizzled yellowish 



fulvous lined with black O. richmondi 248 



j. Under parts yellowish fulvous; above yellowish fulvous 



lined with black 0. fulvescens 248 



209. nelsoni (Oryzomys), Merr., Proc. Biol. Soc. Wash., xn, 1898, 



P- JS- 

 MARIA MADRE ISLAND RICE RAT. 



Type locality. Maria Madre Island, Tres Marias Islands, State of 

 Jalisco, Mexico. 



Gcogr. Distr. Tres Marias Islands, State of Jalisco, Mexico. 



Genl. Char. Larger than O. mexicanus; tail very long, naked. 



Color. Above yellowish fulvous, lined with black on head and 

 back; flanks and thighs buffy ochraceous; under parts white; tail 

 dark brown, yellowish beneath at base. 



Measurements. Total length, 342; tail vertebrae, 190; hind 

 foot, 38. 



