464 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Record and measurement of 39 specimens of Reitlirodontomys Tnegalotis deserti — Continued. 



Locality. 



Well at Cienega, 30 miles south 

 of Monument No. 204, Sonera", 

 Mexico. 



do 



do 



do 



Fort Yuma, San Diego County, 

 California. 



Seven Wells, Lower California.. 



..--do 



---.do 



Gardners Laguna, Colorado 

 Desert, Lower California. 



....do 



---.do 



Mar. 24 



...do... 

 ...do... 

 ...do... 

 Apr. 2 



Apr. 15 

 Apr. 16 

 Apr. 17 

 Apr. 19 



Apr. 20 

 Apr. 26 



Sex and 

 age. 



5 ad. 



S ad.' 

 cf im. 

 ?ad. 



J ad. 

 fad. 



?iuv. 



9 ad. 

 ?lm. 



mm, 

 147 



145 

 126 

 152 

 137 



144 

 160 

 135 

 105 



146 

 108 



mm, 

 74 



76 

 64 

 80 

 70 



79 

 83 

 72' 

 57 



79 

 58 



o (d 



mm. 

 17.5 



17.5 



18.6 

 18.0 



18.0 

 19.0 

 18.5 



17.0 

 15.5 



mm,- 

 12.0 



U.O 



11.5 



13.0 



n.o 



11. s 



12.5 

 10.0 



a In collection of American Museum of Natural History, New York. 



REITHRODONTOMYS LONGICAUDA (Baird). 



SONOMA HARVEST -MOUSE. 



Beiihrodon longicauda Baird, Mam. N. Am., 1857, p. 451 (original description). 

 Ochetodon longicauda, True, Proc. U. S. Nat. Mus., VII, 1885, p. 598. 

 Beithrodontomys longicauda, Allen, Bull. Am. Mus. Nat. Hist., VII, p. 129, May 21, 



1895.— Miller and Eehn, Proc. Bost. Soc. Nat. Hist., XXX, No. 1, Dec. 27, 



1901 (Syst. Results Study N. Am. Mam. to close of 1900). 

 [Beitlirodontomys] longicaudus, Elliot, Field Col. Mus., Zool. Ser., II, 1901, p. 151 



(Synop. Mam. N. Am.); IV, 1904, p. 261 (MaiH. Mid. Am.). 



Type-locality. — Petaluma, Sonoma County, California. 



Geographical range. — Coast region of southern and Lower California, 

 in the Austral and Transition zones. 



Description. — Slightly smaller than R. megalot%s, with relatively 

 smaller ears and a longer tail. Mammae, 3 pairs. Upper parts yel- 

 lowish brown mixed with gray and with blackish rings and tips to the 

 hairs, giving a dark color to the middle dorsal area; sides and rump 

 more fulvous; under parts grayish white, some times washed with 

 clay color and usually with a small fulvous area on the chest; tail 

 rather scantily coated, dusky drab above, whitish below; ears exter- 

 nally hair-brown with a few reddish and grayish hairs intermixed, 

 their concave surface scantily clothed with reddish hair. Quite young 

 individuals are hair-brown above, grayish white below. The skull is 

 shown in fig. 116. 



Measurements. — Average of 20 adult males: Total length, 146 mm. ; 

 tail vertebrae, 77; hind foot, 17; ear from crown, 10.82. Average of 

 15 adult females: Total length, 148.5 mm.; tail vertebrae, 77.33; hind 

 foot, 17; ear from crown, 10.9. 



