292 



MERRIAM 



Remarks. — This very distinct species and its narrow skulled, small 

 toothed relative, angusticeps., belong to the chapmani-hylocetes group, 

 of which they are high mountain representatives. They differ from 

 the other members of the group in having long woolly coats and dis- 

 tinct face markings. 



A specimen from Pinabete, Chiapas ( $ yg.-ad. No. 77604), is 

 darker than adults of rhabdops and has shorter rostrum and nasals, 

 and less spreading zygomata. A series from San Cristobal, Chiapas 

 (all immature), are in the darker pelage of the young rhabdops. They 

 have long rostrums and narrow zygomata but are too young to warrant 

 separation. 



Measure7nents. — Type specimen (^ ad.): total length 355 mm.; 

 tail vertebras 141 ; hind foot 29.5. Average of 3 adults from type 

 locality: total length 250; tail vertebriE 136; hind foot 29. 



ORYZOMYS ANGUSTICEPS sp. nov. 



Type from Volcan Santa Maria, Guatemala (alt. 9000 ft.). No. 

 76S16 t ad. U. S. National Museum, Biological Survey Coll. Jan. 32, 

 1S96. E. W. Nelson and E. A. Goldman. Original number 9190. 



Characters. — Size medium, ears large; color very dark fulvous 

 brown. Externally similar to rhabdops from the high mountains at 

 Calel, Guatemala, but ears larger, color decidedly darker (upperparts 

 more finely mixed fulvous and black) ; cranial characters distinctive. 



Color. — Upperparts and sides (encroaching on sides of belly) finely 

 mixed dark fulvous and black, the black hairs most numerous on top 

 of head and middle strip of back, but not forming a defined darker 

 area; underparts narrowly buffy, the dark slate underfur showing 

 through ; ears and upper side of tail blackish ; underside of tail paler 

 on basal half. 



Cranial characters. — Skull light and smoothly rounded, long and 

 narrow throughout (including braincase, zygomata, and rostrum) ; 

 nasals very long; supraorbital beads obsolete, incisive foramina rather 

 large for the group, broadest in middle ; teeth small and light. 



Measurements. — Type specimen ( ^ ad.) : total length 345 mm. ; 

 tail vertebrae 134; hind foot 39. 



ORYZOMYS MELANOTIS Thomas. 



Oryzomys melanotis Thouxs, Ann. & Mag. Nat. Hist., 6th ser., xi, 404- 

 405, May, 1893. 



Type locality. — San Sebastian, Jalisco, Mexico. 



Characters. — Size medium ; ears large and dark ; color orange 



fulvous; underparts whitish. 



