404 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



Record <nnl measurement of 39 specimens of Reithrodontoimjs mtgalotis rftstrti Continued. 



Museum num.- = 

 ber. = 



60160 

 60122 



60161 



(ill 171 



60825 

 a8070 

 60826 

 O8073 



60827 



«8067 



Locality. 



Well a I I Lenega, 30 miles south 

 hi' Monument No. 204, Sonora, 

 Mexico. 



....do 



. ..do 



Fori Yuma, San Diego County, 

 California - 



Seven Wells, Lower California. . 



....do..... 



....do 



Gardners Laguna, Colorado 



Desert , Lower ( 'alifornia. 



do 



....do 



1894. 

 Mar. 'Jl 



...do... 

 ...do... 

 ...do... 



Apr. 2 



Apr. 15 



Apr. 16 



Apr. 17 



Apr. 19 



Apr. 20 



Apr. 26 



Sea and 



age. 



5 ad. 



f ad. 

 ' in i. 



j ad. 



, ad. 



; ad. 



' 

 | ju\ 



\ ad. 

 , iiii- 



in in . 



17.:, 



L8.6 

 18.0 



in in . 

 12.0 



ll.o 

 11.5 



18.0 13.0 

 19.0 11.0 

 is.:, 11.5 



17.0 

 15.5 



12.5 



10.0 



o In collection of American Museum of Natural Bistory, New York. 



REITHRODONTOMYS LONGICAUDA (BairdL 



SONOMA HARVEST-MOUSE. 



Reithrodon hngicauda Baii;i>, Mam. N. Am., 1857, p. 451 (original description). 

 Ochetodon hngicauda, True, Proc. 0. S. Nat. Mus., VII, 1885, p. 598. 

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



1895.— Miller and Rehn, Proc. Bust. Soc. Nat. Hist ., XXX, No. 1, Dec 27, 



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

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



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



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



Geographical rangt . Coast region of southern and Lower California, 

 in the Austral and Transition zones. 



Description. — Slightly smaller than R. megalohs, with relatively 

 smaller cars and a longer tail. Mamma 1 , 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. 



Measurt in< ids. — Average of 20 adult males: Total length, 146 mm. ; 

 tail vertebra 1 77; hind foot, 17; ear from crown, 10.82. Average of 

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

 foot, 17; ear from crown, 10.9. 



