30 Bulletin American Museum of Natural History. [Vol. XX, 



2. Metachirus fuscogriseus pallidus Allen. One specimen, 

 adult male, April 6. Total length, 581; tail vertebrae, 301; 

 hind foot, 40. 



3. Didelphis mesamericana tabascensis Allen. Two speci- 

 mens, male and female, March 3 and n. 



4. Tamandua tetradactyla (Linn.). Six specimens i 

 young male, 5 adult females March 16-19, April 2-12. 



5. Tayassu angulatum humerale Merriam. Three speci- 

 mens, March 15 and April 5 and 15. 



6. Odocoileus toltecus (Saussure). Four specimens, 3 

 males (2 young) and i female, March 14 and April 10 and 12. 



7. Sciurus aureogaster hypopyrrhus (Wagler). Eighteen 

 specimens, March and April. Four are in the usual red 

 phase, 8 are uniform intense black, and 5 are intermediate, 

 but approach the black phase more than the red phase, most 

 of them having merely a little red on the ventral surface, the 

 rest of the pelage being intense black. 



8. Peromyscus affinis (Allen). Twenty-two specimens, 

 March lo-April 12. 



Young adults are darker than old adults, with the median 

 dorsal area blackish. About half the specimens have a small 

 area of chestnut on the breast, varying in size and distinctness 

 from a mere trace to a well-defined and strongly colored patch, 

 the rest being without even a trace of this marking. Adults 

 range in total length from 170 to 190, averaging about 180; 

 tail vertebrae, 70 to Si, averaging 75; hind foot, 20 to 20.4, 

 averaging 20.2. 



9. Peromyscus mexicanus (Saussure). Eight specimens, 

 March 10-13, an( i April 6; 4 old adults, 3 young adults, and 

 i two thirds-grown young. The adults range in total length 

 from 220 to 240 (av. 230); in length of tail vertebrae from 

 no to 120 (av. 114); hind foot, av. 20.5. 



10. Oryzomys rostratus Merriam. Six specimens, 4 of 

 which are adult, March 11-17 and April 4. Length of adults 



