Goldman — Five New Woodratsfrom Mexico. 141 



intermedia group. Somewhat like N. intermedia, ))ut size smaller, color 

 very much paler, tail relatively shorter and skull very different. Similar 

 in color to N. 7. perpalUda of the neighboring island of San Jose, but not 

 very nearly related; size smaller; tail relatively shorter; skull differing in 

 numerous details. 



Color. — Fresh pelage: Upperparts pale drab gray, palest along cheeks 

 and sides, the dark hairs over top of head and back scarcely numerous 

 enough to alter tlie general color, but producing a grizzled effect; posterior 

 part of back suffused with cinnamon or pale rusty; underparts dull 

 white, the fur basally plumbeous ; feet white ; tail pale grayish above, 

 white below. 



Skull. — Somewhat like that of intermedia, but smaller and more angu- 

 lar ; frontals narrower posteriorly, the constriction nearer middle ; bullae 

 shorter; more rounded; posterior border of palate slightly emarginate 

 (evenly convex in /n/ej-mfrf/fl); mastoid process of squamosal less spatu- 

 late or broadened at tip, leaving mastoid more exposed below lateral 

 extension of supra occipital. Compared with that of perpaHida the skull of 

 ahbreviata is decidedly smaller; nasals broader and more rounded pos- 

 teriorly, frontals relatively narrower posteriorly, the constriction nearer 

 middle; incisive foramina more decidedly longer than palatal bridge; 

 bullae shorter, more rounded. 



Measurements. — Average of 6 adult topotypes: Total length, 304; tail 

 vertebrae, loO ; hind foot, 33. Skull ( average of 5 adults) : Basilar length, 

 34.1; zygomatic breadth, 21.6; length of nasals, 15.4; alveolar length of 

 upper molar series, 8.4. 



Neotoma ferruginea chamula* sul)sp. nov. 



Type from mountains near San Cristobal, Chiapas, Mexico. Altitude 

 8,400 feet. No. 76,061, U. S. National Museum, Biological Survey Collec- 

 tion, o' adult. Collected September 29, 1895, by E. W. Nelson and E. A. 

 Goldman. Original number 8489. 



General characters. — Size large; closely related to N. ferruginea, but 

 color much darker; fur of underparts basally plumbeous everywhere. 

 Similar in size to N. f. isthmica, but color decidedly darker. 



Color. — Type: Upperparts tawny cinnamon rufous, purest along sides, 

 rather heavily darkened by black -tipped hairs which are most abundant 

 over back ; outer sides of legs dark hair brown, the hind legs tinged with 

 brownish bufl"; underparts dull white ; nose, lips and ankles dusky ; fore 

 feet white; hind feet clouded with dusky to toes, the toes white; tail 

 blackish above, grayish brown below. 



Skull. — Closely resembling that of N. ferruginea. Similar to that of 

 N. f. isthmica, but less massive and less arched across anterior roots of 

 zygomata; nasals narrower posteriorly. 



Measurements. — Type: Total length, 363 ; tail vertebrae, 178; hind foot, 

 39. Skull: Basilar length, 37.1; zygomatic breadth, 23; length of nasals, 

 18.3; alveolar length of upper molar series, 9.3. 



* From Chamula, the name of a tribe of Indians living at the type locality. 



