110 Proceedings of the Biological Society of. Washington. 



Color.— Type : General body color coarsely mixed (grizzled) black and 

 gray, the black most profuse along median line from top of head to 

 rump and on middle of chest and abdomen ; face more finely grizzled 

 black and gray ; limbs and feet black. 



Skull.— About like that of P. a. crusnigrum, but rostrum rather slender 

 and molariform toothrows rather short ; posterior molars rather small 

 and short as in other Middle American forms. 



Measurements. — Type : Total length, 890; tail vertebree, 20; hind foot, 

 185. Skull: Greatest length, 218.2; condylobasal length, 186.2; zygo- 

 matic breadth, 98.9; interorbital breadth, 47.2; breadth across postorbital 

 processes, 64.2; palatal length, 132.3; maxillary toothrow, 59; mandi- 

 bular toothrow, 65.3; alveolar length of posterior upper molar, 13.7. 



Remarks.— The Darian collared peccary differs markedly in appearance 

 from the dark, richly colored animal inhabiting western Panama, but 

 along with that form seems clearly assignable to the single species known 

 to occur in Middle America. Except for the indistinct collar it is exter- 

 nally not very unlike Pecari torvus Bangs, of the Santa Marta region of 

 northern Colombia, but the posterior upper molar is less elongated owing 

 to the absence of prominently developed and apparently important ele- 

 ments behind the hypocone and metacone. The metaconule is also 

 smaller. 



Specimens examined. — Total number, 13, as follows: Canal Zone: Gatun, 

 2. Panama: Boca de Cupe (type locality), 1. 



Peromyscus eremicus papagensis,* subsp. nov. 



PINACATE DESERT MOUSE. 



Type from Pinacate Mountains, Sonora, Mexico. No. 210,698, $ adult, 

 U. S. National Museum (Biological Survey collection), collected by 

 Charles Sheldon in February, 1915. 



General characters. — Similar in general to Peromyscus eremicus eremicus 

 and Peromyscus eremicus anthonyi, but upperparts decidedly darker, the 

 general tone vinaceous-buffy instead of ochraceous-buffy. 



Color. — Type (fresh pelage): Upperparts vinaceous-buff, becoming 

 somewhat tawny on flanks, the top of head and back strongly darkened 

 by black hairs ; underparts overlaid with white, the basal color plumbeous, 

 except on chin and lips where the fur is pure white to roots; ears 

 and orbital borders blackish ; feet white ; tail bicolor, blackish above, dull 

 whitish below except near tip which is dark all around. Young (in first 

 pelage) : Upperparts near neutral gray, mixed with black. 



Skull. — As in P. e. anthonyi. 



Measurements.— Type (from dry skin): Total length, 196; tail vertebrae, 

 102; hind foot, 20.5. Skull (type): Greatest length, 25.5; zygomatic 

 breadth, 13.3; interorbital breadth, 4; length of nasals, 8.9; length of 

 anterior palatine foramina, 4.7; length of palatal bridge, 4.1; maxillary 

 toothrow, 3.8. 



* From Papago, the name of the tribe of Indians inhabiting the general region of 

 the type locality. 



