RICE RATS 289 



seems to be intermediate between the smaller chapmani group and 

 the \?^x^QX jalap ce group, with bulleri as the nearest relative in the 

 direction oi jalap c^. But the gaps in both directions are wide. 



Measurements. — Type specimen ($ ad.): total length 233 mm.; 

 tail vertebras 124; hind foot 30. 



ORYZOMYS CHAPMANI Thomas. 



Oryzomys chapmani Tnouxs, Ann. & Mag. Nat. Hist., 7th ser., i, 179-180, 

 February i, 1898. 



T'ype locality. — Jalapa, Vera Cruz, Mexico. 



Characters. — Size small ; pelage short or rather coarse ; coloration 

 dark; ears rather large and dark; tail small and slender; skull small, 

 smooth and mouselike. 



Color. — Upperparts finely grizzled fulvous and black, the black hairs 

 most numerous on top of head and middle of back ; underparts whitish, 

 the slaty underfur showing through ; ears and tail blackish ; under side 

 of tail yellowish, except on terminal part, which is dark all around. 



Cranial characters. — Skull resembling that of an ordinary white- 

 footed mouse, Peroi7tysctis\ small, light, smoothly rounded, without 

 conspicuous superciliary beads ; zygomata rather strongly spreading 

 anteriorly, the outer sides nearly parallel but slightly nearer together 

 anteriorly than posteriorly; rostrum rather long; nasals blunt pos- 

 teriorly, ending about on a plane with premaxillag ; incisive foramina 

 rather small. 



Measurements. — [From Chapman] Average of 1 1 males from 

 type locality: total length 222 mm.; tail vertebrae 119; hind foot 

 25.2. Average of 5 females from type locality: total length 219; 

 tail vertebrae 116; hind foot 24.6. 



Average of 2 adults ( $ and $ ) from Jico, Vera Cruz [measured 

 by Nelson and Goldman]: total length 224; tail vertebras 11 7.5; 

 hind foot 26. 



ORYZOMYS CHAPMANI CAUDATUS subsp. nov. 



Type from Comaltepec, Oaxaca, Mexico. No. 68641 $ ad. U. S. 

 National Museum, Biological Survey Coll. Ji-'^y 31, 1894. E. W. 

 Nelson and E. A. Goldman. Original number 6516. 



Characters. — Shmilav to chapmani hut larger, tail much longer: 

 color slightly darker ; skull larger and heavier with larger rostrum 

 and broader nasals. 



Measurements. — Type specimen ( ^ ad.) : total length 257 mm. ; 

 tail vertebrae 141 ; hind foot 30. 

 Proc. Wash. Acad. Sci., July, 1901. 



