246 Bulletin American Museum oj Natural History. [Vol. XXII, 



are yellowish chestnut above varied with small white spots bordered 

 with blackish, but about one in six are decidedly paler and more 

 grayish. This difference proves to be purely individual and is not 

 due to condition of pelage. 



10. Mus rattus Linn . 



Six specimens: 2 typical examples and i hybrid between M. 

 rattus and M. alexandrinus , but with the characteristics of the latter 

 the most pronounced, near Amatlan, Tepic, Jan. 16 and Feb. 15; 

 Las Canoas, i specimen, very young, Aug. 26; Los Masos, 2 speci- 

 mens, typical. 



"Blue Rat. Common on the Pacific slope from Mazatlan into 

 State of Jalisco."]. H. B. 



1 1 . Mus alexandrinus Geoff roy. 



Two very young examples, taken at Las Canoas, Sept. i, and a 

 half-grown one at Los Masos. 



12. Peromyscus melanotis melanotis Allen & Chapman. 



Fifty -four specimens, all from Vole an de Nieve, taken at an. 

 altitude of 12,500 to 13,000 feet (near timber line), Sept. 5-18. 



These specimens are all in the dark pelage and look very unlike 

 April and May specimens, in the red phase, from the type locality 

 and points in the high tableland of the States of Vera Cruz and Hi- 

 dalgo, at altitudes of about 8000 feet. I am especially indebted to 

 the kindness of Mr. Osgood for their identification 



13. Peromyscus labecula Elliot. 



One hundred and forty-one specimens, collected as follows: 

 Arroyo de Plantanar, Jalisco, 3 specimens, Feb. 18 and 19; Ojo de 

 Agua, near Amatlan, Terr. Tepic, 4 specimens, Feb. 15; Garabatos, 

 Jalisco, i specimen, March 27; Estancia, Jalisco, 5 specimens, Feb. 

 3 and 22, March 8, n, and 17; Las Canoas, 113 specimens, Aug. 

 5 Sept. i; Los Masos, 15 specimens. 



14. Peromyscus hylocetes Merriam. 



Six specimens, all adult, taken as follows: Volcan de Nieve, i 

 specimen, Sept. 16; Tanko Riparti (10,500 feet), 5 specimens, Sept. 

 22-24; Los Masos, i specimen. 



