648 Bulletin American Museum of Natural History. [Vol. XXIV, 



of Mammals, United States National Museum, for the use of important 

 specimens for examination in the present connection, including the type of 

 the genus Bassaricyon. 



1. Marmosa murina (Linnceus). One specimen, San Rafael del Norte, 

 April 11, 1907. 



2. Marmosa murina mexicana Merriam. One specimen, Volcari de 

 Chinandega, May 9, 1907. 



3. Caluromys laniger pallidus Thomas. One specimen, adult male, 

 Matagalpa, April 30, 1906. 



4. Metachirus fuscogriseus Allen. Six specimens (5 9, Id 1 ): Mata- 

 galpa, Dec. 12, 1906, Jan. 8 and Nov. 17, 1907; San Rafael del Norte, 

 April 16; Lavala, Oct. 6; Tuma, Nov. 26, 1907. 



5. Metachirus nudicaudatus colombianus Allen. One specimen, male, 

 not quite adult (last molar just in place), Chontales, Feb. 27, 1908. 



Very closely resembles the type of this subspecies; but the top of the 

 head and nape are blacker, and the general coloration above is slightly 

 darker. Further material may show that the forms from the two regions 

 are subspecifically separable. 



6. Didelphis mesamericana tabascensis Allen. Six specimens four 

 adult (3 d\ 1 9) and two about one-fifth grown, taken at Matagalpa, 

 Jan. 8, 25, and 28, and Sept. 14 and 17, and at Lavala, Oct. 6, 1907. Five 

 are in the gray phase and one in the black phase. The two young ones are 

 about the same age, but one was taken Jan. 8, and the other Oct. 6. 



7. Choloepus hoffmanni Peters. Two specimens, a young male and 

 an adult female, Matagalpa, Jan. 2, 1908. 



8. Bradypus griseus (Gray). Two specimens, an adult female and a 

 young female about one fourth grown, Chontales, Feb. 20, 1908; said by the 

 collector to be mother and young. 



The aduk has a long black dorsal stripe, extending from the front of the 

 shoulders to the middle of the back, flanked on either side by a narrow band 

 of dull orange, which fades out laterally into a broader band of yellowish 

 white. The young specimen has a short dull black dorsal stripe of soft 

 black hair, shorter than in the adult, and not bordered by orange and 

 yellowish white as in the adult. The young specimen is apparently still 

 in first pelage, with the general color above dull cinnamon brown, instead 

 of gray brown varied with white as in the adult. 



The name griseus Gray is adopted provisionally, as the description and 

 type locality are fairly pertinent. 



9. Cyclopes dorsalis (Gray). One specimen, male, Rio Grande, 

 April 7, 1908. 



10. Tamandua tetradactyla chiriquensis Allen. One specimen, adult 

 male, Ocotal, May 7, 1908. 



