70 Osgood Thirty New Mice of the Genus Per omy soils. 



Color. Type: Sides rich chestnut shading into a well-defined blackish 

 area in median dorsal region ; a narrow black orbital ring and spot at 

 base of whiskers; under parts slate color overlaid with creamy white (no 

 pectoral spot in type, but of frequent occurrence among series of topo- 

 types) ; tail black except a few irregular spots of yellowish white on 

 under side; fore feet white; hind feet white except a dark brown area 

 extending, and decreasing in width, from ankles down nearly to base of 

 toes. 



Skull. Similar to that of totontepecus, but with broader nasals and gener 

 ally heavier and more thickened rostral region; anterior palatine for 

 amina usually wider; infraorbital part of zygoma rather heavier than 

 in totontepecus, but not squarely 'elbowed' as in mexicanus ; teeth about 

 as in tolonlepecus, wider and heavier than in mexicanus. 



Measurements. Average of 10 adults from the type locality: Total 

 length, 245 (234-254) ; tail vertelme, 129 (121-136) ; hind foot, 28 (27-28.5). 

 Skull of type: Greatest length, 33; basilar length of Hensel, 24.6; 

 zygomatic width, 16.2; nasals, 12.7; interorbital constriction, 5.4; pala 

 tine slits, 6x2.9; upper molar series, 4.5; bony palate, 4.7; diastema, 

 8.2; postpalatal length, 11.9. 



Remarks. Represented by a series of 17 specimens containing a good 

 percentage of adults and showing very little variation. Two specimens 

 from Montecristo, Tabasco, are decidedly paler, much as in true me.vi- 

 canus. The form is not strongly marked, but ranks well with the others 

 of the same group, which is a difficult one. The vicinity of Teapa, 

 visited by Nelson and Goldman in the spring of 1900, is already well 

 known for the dark, rich color of the animals found there. The pres 

 ent subspecies is no exception. 



Peromyscus yucatanicus badius subsp. nov. 



Type from Apazote, Campeche, Mexico. Adult female, No. 108,016, 

 U. S. National Museum, Biological Survey Collection, December 28, 1900, 

 E. W. Nelson and E. A. Goldman. 



Characters. Similar to P. yucatanicus but darker colored. 



Color. Decidedly darker than P. yucatanicus, having a median dorsal 

 area with a strong ail mixture of black and more or less black on the sides 

 except a narrow lateral line which is cinnamon rufous like the general 

 ground color; under parts faintly suffused with yellow; a narrow black 

 orbital ring ; hairs of tail blackish brown above, white below ; under side 

 of tail beneath hairs chiefly yellowish white, but somewhat irregularly 

 blotched with dusky ; feet white. 



Skull. As in P. yucatanicus. 



Measurements. Average of 10 topotypes : Total length, 193.4; tail 

 vertebrae, 96.7; hind foot, 23.5. Skull of type: Greatest length, 28.2; 

 basilar length of Hensel, 20.7; zygomatic width, 14.1; interorbital con 

 striction, 4.7; interparietal, 9.2x3.1; nasals, 10.4; bony palate, 4.2; 



