548 MERRIAM 



amina long and rather slender ; bulke small, set very obliquely to axis 

 of skull ; molars rather large. 



Measureinents. — Type specimen ( $ ad.) : total length 210 mm. ; 

 tail vertebrae 124; hind foot 23. 



Skull: basal length 21.5; zygomatic breadth posteriorly 13; length 

 of palate 12.5 ; length of molar series 4. 



REITHRODOXTOMYS TENUIROSTRIS AUREUS subsp. nov. 



Type from Calel, Guatemala (altitude 10,200 ft.). No. 76939. 



9 ad. U. S. National Museum, Biological Survey Coll. Jan. 15, 



1896. E. W. Nelson and E. A. Goldman. Orig. no. 9140. 



Characters. — Similar in general to A', temcirostris^ but very much 

 paler and yellower; underparts in adult purer fulvous (less of the sal- 

 mon tinge) ; underparts in a young specimen whitish. The skull dif- 

 fers from that of tenuirostris in the following particulars: braincase 

 less inflated; nasals narrower posteriorly and ending slightly in front 

 of premaxillaj; zygomata slightly less spreading anteriorly, their sides 

 not parallel; palate shorter; the incisive foramina long and cutting 

 plane of first molars ; bullae less oblique. 



i\Ieasitrements. — Type specimen (9 ad.): total length 196 mm.; 

 tail vertebraj 112; hind foot 22.5. 



Skull: basal length 20; zygomatic breadth posteriorly 13; length 

 of palate 11.5 ; length of molar series 4.5. 



REITHRODONTOMYS MICRODON sp. nov. 



Type from Todos Santos, Guatemala (altitude 10,000 ft.). No. 



76923. 9 ad. U. S. National Museum, Biological Survey Coll. 



Dec. 31, 1S95. E. W. Nelson and E. A. Goldman. Orig. no. 



8977. 



Characters. — Size small; tail and ears long, dark, and nearly 

 naked; fur long, soft and full; general appearance almost exactly as 

 in the much larger R. tenuirostris., of which externally it is an almost 

 exact miniature. 



Color. — Upperparts deep reddish fulvous, most intense on rump, 

 palest on head ; sides bright fulvous; underparts salmon fulvous (in 

 young specimens sometimes white) ; a dark ring around eye; a dark 

 brown spot on wrists; fore feet and toes white; ankles and hind feet 

 dark brown; toes white; tail dark all around, but slightly paler 

 beneath. 



Cranial characters. — Skull small, light and papery, with rounded, 

 inflated braincase and rather squarely spreading zygomata; rostrum 

 and nasals slender, nasals ending about on plane of premaxillaa. Com- 



