Osgood Thirty New Mice of the Genus Peromyscus. 59 



Remarks. P. L castaneus is nearly the same color as P. cozumelee, which 

 is closely related. P. cozumelse differs chiefly in larger size and heavier 

 teeth. No specimens from the humid tropical region between Orizaba 

 and Yohaltun are at hand, but castaneus is not sufficiently different from 

 mesomelas to warrant full specific rank. P. affinis is a related form of the 

 adjacent arid tropics, and much paler than either castaneus or mesomelas. 



Peromyscus melanotis zamelas subsp. nov. 



Type from Colonia Garcia, Chihuahua, Mexico (altitude 6700 feet). 

 Adult female, No. 98,197, U. S. National Museum, Biological Survey 

 Collection, July 23, 1899, E. W. Nelson and E. A. Goldman. 



Characters. Similar in general to P. melanotis but coloration more 

 sooty ; size small ; tail short ; skull not peculiar. 



Color. Sides dark cinnamon rufous, densely clouded with sooty ; broad 

 stripe from top of head to base of tail intense black ; orbital ring and base 

 of whiskers black ; sides of face suffused with sooty ; a cinnamon rufous 

 patch below eye continuous with a narrow lateral line of the same color ; 

 feet white; tail sharply bicolor, black above, white below; under parts 

 white subdued by plumbeous under-color. 



Skull. Practically as in melanotis; size quite small; molar teeth par 

 ticularly small. 



Measurements. Type: Total length, 160; tail vertebrae, 63 ; hind foot, 

 20. Skull of type : Greatest length, 25.9 ; basilar length of Hensel, 19.3 ; 

 zygomatic width, 13; interorbital constriction, 4; interparietal, 8x2.2; 

 nasals, 11; bony palate, 3.8; palatine slits, 5.3x2.1; diastema, 7; post- 

 palatal length, 8.5; upper molar series, 3.3. 



Peromyscus attwateri pectoralis subsp. nov. 



Type from Jalpan, Queretaro, Mexico. Adult male, No. 81,236, U. S. 

 National Museum, Biological Survey Collection, August 30, 1896, E. W. 

 Nelson and E. A. Goldman. 



Characters. Similar to P. attwateri, but richer colored and having a 

 prominent buffy pectoral spot; tail longer; size medium (hind foot 21- 

 23); superficially similar to P. eremicus ; color darker and more vinaceous ; 

 pelage slightly less silky ; tail longer and more hairy; soles of hind feet 

 naked or with slight hairiness on heel ; ankles usually white ; skull rather 

 heavy ; molar teeth with small accessory tubercles of subgenus Pero 

 myscus. 



Color. Type, in fresh fall pelage: Ground color of upper parts pale 

 ochraceous buff with a thick sprinkling of dusky, producing an effect 

 nearly the shade of wood brown ; sides of head behind eyes grayish ; a 

 narrow blackish orbital ring; a distinct buffy ochraceous pectoral spot 

 usually present ; feet, and in most cases ankles, white ; under parts white ; 

 tail dusky above, white below. 



