66 



NOETH AMEEICAN FAUNA. 



[No. 36. 



ObZor.— Upperparts pinkish cinnamon with an ochraceous tinge, 

 mixed with brownish black; miderparts heavily washed with light 

 pinkish cinnamon; sides without a distinct lateral line of ochraceous; 

 ears between fuscous and hair-bro^vn with scattering ochraceous hairs 

 on inner surface; front feet dull huffy white; hind feet grayish, with 

 a tinge of buff; ankles dark hair-brown; tail hair-brown above, 

 soiled whitish below. 



Slcull. — Similar in size and shape to that of R. f. toltecus but brain- 

 case flatter and zygomata narrowed anteriorly; nasals and pre- 

 maxillse as in toltecus; audital bullse also similar (larger than in R. 

 levipes); foramen magnum very large; molars with simple enamel 

 pattern, as in the fulvescens group. 



Measurements. — Type: Total length, 202; tail vertebras, 120; hind 

 foot, 22. Skull: (See table, p. 81). 



RemarJcs. — This seems to be a well-marked species, but as only a 

 single specimen is known its relationships are not clear. In skull 

 characters it resembles R. f. toltecus rather closely and differs from 

 R. levipes in having a longer, narrower skull, with larger buUag and 

 no subsidiary enamel loops on the upper molars, being therefore in 

 the typical subgenus. The ground color of the upperparts is similar 

 to that of toltecus, but is a little duller and the blacldsh median 

 band is lacking; the underparts are decidedly more ochraceous. 

 There is no evidence to show that it intergrades mth toltecus, so for 

 the present it seems best to consider it a distinct species. The 

 simple enamel pattern of the molars shows it to be not closely related 

 to levipes, which is in the subgenus Aporodon. 



Specimen examined. — One, the type. 



EEITHRODONTOMYS RUFESCENS GROUP. 



REITHRODONTOMYS RUFESCENS RUFESCENS Allen & Chapman. 



RuFEscENT Harvest Mouse. 



Reithrodontomys rufescens Allen & Chapman, Bull. Am. Mus. Nat. Hist., IX, 1897, 

 p. 199. 



Type locality. — Jalapa, Vera Cruz, Mexico. 



Distribution. — Mountain slopes of eastern Mexico in the States of 

 Queretaro, Hidalgo, Puebla, Vera Cruz, and Oaxaca. 



Characters. — ^Larger than R. fulvescens difficilis and much darker; 

 sides lacking the bright ochraceous line characteristic of the fulves- 

 cens group; tail blackish, unicolor. 



Color. — Fresh pelage (April specimens, Jalapa, Vera Cruz): Upper- 

 parts tawny, strongly mixed with black over the entire dorsal area from 

 nose to tail; sides nearly pure tawny; ears varying from fuscous to 

 fuscous-black; feet buffy white washed with fuscous; tail fuscous, 

 nearly unicolor, clothed with scattered grayish hairs; underparts 



