MARMOSA. 6 



Skull: Occipito-nasal length, 43; Hensel, 36.4; zygomatic width, 

 23.7; inter temporal width, 6.2; length of nasals, 20; palatal length, 

 21.5; length of upper molar series, 13.7; length of mandible, 30.6; 

 length of lower molar series, 14.4. Ex type in United States National 

 Museum. 



Marmosa gaumeri Osgood. 



Marmosa gaumeri Osgood, Proc. Biol. Soc. Wash., XXVI, 1913, 



P- 175- 



Type locality. Yaxcaba, southwest of Chichen Itza, Yucatan, 

 Mexico. 



Genl. Char. Similar to M. canescens, but smaller. Skull small 

 and narrow. 



Color. Upperparts dull brownish fawn mixed with dusky, this 

 hue extending down outer sides of fore and hind legs; orbital ring 

 blackish brown; cheeks, underparts and inner side of limbs pale cream 

 color; tail above brownish drab, paler beneath; feet cream white. 

 Ex type in Field Museum of Natural History. 



Measurements. Total length, 205; tail, 105; hind foot, 15. 

 Skull: Greatest length, 304; zygomatic breadth, 17.3; interorbital 

 constriction, 5.1; occipito-nasal length, 29.2; Hensel, 23; length of 

 nasals, 12.2; palatal length, 16.1; length of upper tooth row, 12.3, 

 including canines. Ex type in Field Museum of Natural History. 



Marmosa mayensis Osgood. 



Marmosa mayensis Osgood, Proc. Biol. Soc. Wash., XXVI, 1913, 

 p. 176. 



Type locality. Izamal, Yucatan, Mexico. 



Genl. Char. Like M . mexicana but paler. Type in Field Museum 

 of Natural History. 



Color. Upperparts cinnamon mixed with dusky; flanks cinnamon ; 

 orbital ring black; underparts creamy white, base of hair on sides 

 slate color; tail drab-brown. Type in Field Museum of Natural 

 History. 



Measurements. Total length, 228; tail, 118; ear, 15. 



Marmosa invicta Goldman. 



Marmosa invicta Goldm., Smith. Misc. Coll., LX, No. 2, 1912, p. 3. 



Type locality. Cana, eastern Panama. 



Color. Upperparts blackish slate; (the type is rusty, however, 

 from the occiput) ; between shoulders to the lower part of the dorsal 



