8 MARMOSA. 
Geogr. Distr. Tres Marias Islands, State of Jalisco, Mexico. 
Genl. Char. Similar to M. canescens, but ears and tail longer, 
color more fulvous. Skull narrower and more slender. 
Color. Upper parts drab brown, suffused with pale fulvous; 
orbital ring broad, black; median face stripe buffy fulvous; under 
parts buffy yellow, darkest on throat and breast; tail brown, no 
white. 
Measurements. Total length, 270; tail vertebre, 170; hind 
foot, 20. 
7. oaxace (Marmosa), Merr., Proc. Biol. Soc. Wash.. x1, 1897, p. 43. 
Oaxaca Opossum. 
Type locality. City of Oaxaca, State of Oaxaca, Mexico. 
Geogr. Distr. Range unknown. ‘‘Sonoran fauna of highlands of 
the State of Oaxaca, Mexico.”’ 
Genl. Char. Size small; darker than M. canescens; feet and ears 
smaller. 
Color. Above dark sepia brown, reaching wrists and ankles; 
beneath buffy yellow; nose on top to behind eyes pale brown; orbital 
ring black; tail brown above, white beneath. 
Measurements. Total length, 263; tail vertebra, 144; hind foot, 
18. Skull: basal length, 29; zygomatic breadth, 18.5; palatal length, 
17; interorbital constriction, 4.8; breadth of frontals, 8. (ex Type.) 
8. fulviventer (Marmosa), Bangs, Amer. Nat., Xxxv, rgor, p. 632. 
FULVOUS-BELLIED Opossum. 
Type locality. San Miguel Island, Bay of Panama. 
Genl. Char. Similar to MW. mitis Bangs ex Colombia, but smaller 
in size and under parts fulvous instead of yellowish white. 
Color. Black facial markings as usual in species of this genus; 
upper parts cinnamon or tawny ochraceous; upper surface of arms, 
sides of neck and of body ochraceous rufous; under parts buff shading 
into ochraceous buff on lower sides, and on inner surface of arms and 
legs; tail dusky above, paler beneath; feet and hands grayish white. 
Measurements. Total length, 325-340; tail vertebrae, 175-180; 
hind foot, 23-25; ear from notch, 20-22. Skull: basal length, 34.4; 
occipito-nasal length, 37.4; zygomatic width, 20.4; interorbital con- 
striction, 6.2; length of nasals, 17.6; width of nasals, 5; palatal length, 
18.8; upper tooth row from anterior edge of canine to posterior edge 
of last molar, 15.2; length of single half mandible, 27.8. 
