MILLER AND REHN : NORTH AMERICAN MAMMALS. 155 



Perodipus streatori Merriam. 



1894. Perodipus streatori MERRIAM, Proc. biol. soc. Wash- 

 ington, ix, p. 113. June 21, 1894. 

 TYPE LOCALITY. Carbondale, Mariposa County, California. 



Genus MICRODIPODOPS Merriam. 



1891. Microdipodops MERRIAM, North Amer. fauna, no. 5, p. 

 115. July 30, 1891. Type. Microdipodops megacephalus MER- 

 RIAM. 



Microdipodops megacephalus Merriam. 



1891. Microdipodops megacephalus MERRIAM, North Amer. 



fauna, no. 5, p. 116. July 30, 1891. 



TYPE LOCALITY. Halleck, East Humboldt Valley, Elko 

 County, Nevada. 



Subfamily HETEROMYINAE. 



Genus PEROG-NATHUS Wied. 1 



1839. Perognathus WIED, Nova acta phys. med. acad. caes. 

 Leop.-Carol., xix, pt. i, p. 368. Type. Perognathus fasciatus 

 WIED. 



Subgenus PEROGXATHUS. 



^Perognathus fasciatus Wied. 



1839. Perognathus fasciatus WIED, Nova acta phys. med. 

 acad. caes. Leop.-Carol., xix, pt. i, p. 369. 



1 Revised by Merriam (North Amer. fauna, no. 1, October 25, 1889) and Osgood (North 

 Amer. fauna, no. 18, September 20, 1900). 



