108 Bailey North American /Species of Sigmodon. 

 Sigmodon hispidus arizonae Mearns. 



Sigmodon hispidus arizonae Mearns, Bull. Am. Mus. Nat. Hist. II, 287, 

 Feb. 21, 1890. 



Type locality. Ft. Verde, Arizona. 



General cliaracters. Size large; pelage coarse and hispid; colors pale. 



Color. Upperparts light buffy gray as in berlandieri; nose slightly 

 yellowish; belly white; feet and tail as in berlandieri and eremicus. 



Skull. I have not been able to get a skull of this species for exam 

 ination, but the original measurements show it to have been larger than 

 the average eremicus skull. 



Measurements. Type (from original description): total length 320; 

 tail 121. Hind feet of two topotypes taken from dried specimens, 35 and 

 36. Skull (from original description): total length 40; nasals 15.9; zygo- 

 matic breadth 23; alveolar length of upper molar series 7.1. 



Remarks. Without seeing skulls of this form I am in doubt as to its 

 status and affinities, but the two skins from the original topotype series, 

 kindly sent for examination by Dr. Allen, indicate a larger form than 

 eremicus with more hispid pelage. 



Sigmodon hispidus mascotensis Allen. 



Sigmodon mascotensis Allen, Bull. Am. Mus. Nat. Hist. IX, 54, March 

 15, 1897. 



Sigmodon colimae Allen, Bull. Am. Mus. Nat. Hist. IX, 55, March 15, 

 1897. From Plains of Colima, Colima, Mexico. 



Type locality. San Sebastian, near Mascota, Jalisco, Mexico. 



General characters. Slightly larger than hispidus or berlandieri, with 

 especially longer tail and larger hind foot; pelage in summer very coarse 

 and hispid. 



Color. Upperparts dark buffy gray with bright buffy or ochraceous 

 nose; belly yellowish white; feet dull brownish gray; tail brownish 

 gray below and brownish black above, less distinctly bicolor than in 

 berlandieri. 



SkuU. Averaging larger than in berlandieri with relatively smaller 

 bullae and the same concavo-convex interparietal and posteriorly trun 

 cate nasals. 



Measurements. Type (from skin): total length 272; tail 117; hind foot 

 32. Average of 6 adults from Colima: total length 253; tail 116; hind 

 foot 34. Skull of type: basal length 30.7; nasals 13.3; zygomatic 

 breadth 19.4; mastoid breadth 13.2; alveolar length of upper molar 

 series 6. 3. 



Distribution. West coast of Mexico from western Jalisco to southern 

 Oaxaca. 



Specimens examined. Total number 62 from the following localities: 



Jalisco: San Sebastian 2. 



Colima: Colima 10, Armeria 12. 



