70 Osgood — Thirty New Mice of the Genus Peromyscus. 



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

 area in median dorsal region ; a nari'ow black orbital ring and spot at 

 base of whiskers; under parts slate color overlaid with creanij' 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. 



S/cuU. — Similar to that of toiontepecm, but with broader nasals and gener- 

 ally heavier and more tliickened rostral region; anterior palatine for- 

 amina usually wider; infraorbital part of zygoma rather h.eavier than 

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

 as in tolonlepecus, wider and heavier than in mexicanus. 



Measuremenls. — Average of 10 adults from the type locality: Total 

 length, 245 (234-254) ; tail vertebne, 129 (121-136) ; liind 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, () X 2.9; 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, Tabasc;o, are decidedly paler, much as in true mexi- 

 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 sul)sp. 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 admixture 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 alwve, white below ; under side 

 of tail beneath hairs chiefly yellowish wdiite, but somewhat irregularly 

 blotched with dusky ; feet white. 



Skull. — As in P. yucatanicus. 



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

 vertebrfe, 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; 



