MILLER AND REHN ; NORTH AMERICAN MAMMALS. 155 
I Perodipus streatori Merriam. 
I 1891. Perodipus streatori Merriam, Proc. biol. soc. Wash- 
r • ington, IX, p. 113. June 21, 1894. 
^ Type locality. — Carbondale, Mariposa County, California. 
Genus MICRODIFODOFS Merriam. 
1891. Microdipodops Merriam, North Amer. fauna, no. 5, p. 
115. July 30, 1891. Type. — Microdipodops megacephalusM^^- 
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 Heteromyixae. 
Genus PEROGNATHUS Wied.^ 
1839. Perognathus Wied, Nova acta phys. med. acad. caes. 
Leop.-Carol., xix, pt. i, p. 368. Type. — Peroguathus fasciatus 
Wied. 
Subgenus Perocxathus. 
^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). 
