XO. 2 NEW MAMMALS FROM EASTERN PANAMA GOLDMAN 3 



gray; under side of neck, except median stripe, grayish tinged with 

 buffy; general color of under parts interrupted along median stripe 

 which is buffy on neck, becoming pure white and broadening on 

 chest, and narrowing gradually along a line extending posteriorly to 

 near base of tail; chin with a small central while spot : ears dusky; 

 limbs, feet and tail black all round. 



Skiti'l. — Rather broad across anterior roots i E zygomata: sides 

 rostrum tapering rapidly to rather high and narrow anterior nares ; 

 nasals moderately expanded posteriorly, the expansion beginning 

 near middle; premolars closely crowded; third upper molar deeply 

 emarginate on outer side; posterior lower premolar smaller than 

 middle premolar, the crown broad and extended antero-posteriorly. 



Measurements. — Type: Total length, 168 mm.; tail vertebrae, 

 60; hind foot, 16.5. Skull (type): Condylobasal length. 28; nasals, 

 13.7 x 4.3; palatal length. 15; tipper molariform tooth vow, 9.5; 

 upper molar series, 5.8. 



Remarks. — The type and only specimen obtained of this very 

 dark colored species seems to differ considerably from all of the 

 previously known members of the genus. It may lie similar to 

 adust us. but the latter is described as lighter in color and apparently 

 differs in other characters. 



MARMOSA INVICTA, sp. now 



Type from Cana (altitude 2.000 feet), in the mountains of eastern 

 Panama. Xo. 178708, male adult, U. S. National Muesum 1 Biologi- 

 cal Survey Collection), collected March 14. 1912. Original num- 

 ber 21 5 1 7. 



General characters. — Size rather small ; form slender : >li r very 

 dark: skull smoothly rounded, without supraorbital or temporal 

 ridges, and scarcely a trace of postorbital processes. 



Color. — General color of upper parts in fresh pelage blackish slate 

 with a faint silvery sheen, darkening to pure glossy black on lower 

 part of back and rump (becoming dull, very dark brown in worn 

 pelage); middle of face mouse gray; under parts, including inner 

 sides of limbs lightly washed with silvery white, the under color of 

 the fur slaty black ; scrotum clothed with short silky hairs which are 

 silverv white to roots, in marked contrast with the dark body color; 

 mammae in adult female enclosed in a cinnamon brownish area: 

 chin, lips and lower part of cheek- whitish; antorbital spots black: 

 wrist>. ankles and feet to tors dusky, the toes while: tail dark brown- 

 ish above, somewhat lighter below. 



