PERODIPUS. MICRODIPODOPS. 299 



740. Perodipus obscurus Allen. 



Perodipiis obscurus Allen, Bull. Am. Mus. Nat. Hist. N. Y.. 1903, 

 p. 603. Elliot, Mamm. Middle Amer. & W. Indies, F. C. M. 

 Pub., IV, Pt. I, 1904, p. 351. Zool. Ser. 

 Dusky Kangaroo Rat. 



Type locality. Rio Sestin, State of Durango, Mexico. 



Geogr. Distr. State of Durango. 



741. Perodipus compactus (True). 



Dipodomys compactus True, Proc. U. S. Nat. Mus., 1888, p. 160. 

 Perodipus compactus Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 

 II, 1901, p. 240. Zool. Ser. 

 Thick-set Kangaroo Rat. 



Type locality. Padre Island, Cameron County, Texas. 

 Geogr. Distr. Known only from the type locality. 



Genus 97. >li<To<li|>o<l<>ps. Siiuill KaiiK'siroo IJjits. 



Microdipodops Merr., N. Am. Faun., No. 5. 1891, p. 115. Type 

 Microdipodops megacephalus Merriam. 



742. Microdipodops megacephalus Merriam. 



Microdipodops nicgiiccplialus Merr., N. Am. Faun.. No. 5, 1891, 

 p. 116. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 1901, 

 p. 241, fig. 55. Zool. Ser. 

 Large-headed Kangaroo Rat. 



Type locality. Halleck, East Humboldt Valley, Elko County, 

 Nevada. 



Geogr. Distr. Central Nevada. 



II. ,]/ icrod i f)ft(/(i/)s mr^dccplinl 11 x otp^ouk.h Merriam. 



Microdipodops vtegacephalus oregonus Merr., Proc. Biol. Soc. Wash., 

 XIV, 1901, p. 127. 

 Oregon Kangaroo Rat. 



Type locality. Lake Alvord, Alvord Desert, Harney County, 

 Oregon. 



Geogr. Distr. Known only from the type locality. 



Genl. Char. Similar to M. megacephalus, but tail longer. 



Color. Above olivaceous, slightly lined with black ; beneath white ; 

 under side of tail with white streak. 



Measurements . Total length, 153 ; tail vertebrae, 88; hind foot, 21. 



743. Microdipodops pallidus Merriam. 



Microdipodops pallidus Merr., Proc. Biol. Soc. Wash., xiv, 1901, 

 p. 127. 



