MAMTVTALS OF THE MEXICAN BOUNDARY. 



465 



Remarks. — In the series of about 70 specimens before me from the 

 Pacific section of the boundary strip (Mountain kSpring to San Diego), 

 but httle variation in color is observed, though some are in late winter 

 dress and others in summer pelage. In the latter the coat is shorter 

 and a shade darker. They are quite uniform, however, and agree 

 essentially with fresh topotypes of Baird's B. longicauda and Rhoads's 



Fig. U6.— Keithrodontomys longicauda. 



Skull, u, dorsal view, 6, ventral view; c, lateral 



VIEW. 



R. pallidus. I have compared them with the type of R. pallidus, 

 which is an immature example of R. longicauda Baird, and a little 

 darker than any other specimen from California that I have seen. 



The Sonoma harvest-mouse is abundant in damp localities of the 

 Pacific Coast Tract. The young, numbering from 3 to 5 in a litter, 

 are born during Maj- and June. 



Record and measurements of 60 specimens of Reiihrodoniomys longicauda. 



Museum num- 

 ber. 



03289 

 61030 



08079 

 60816 

 61035 



61039 

 61041 

 61042 

 61046 

 O8089 

 60817 

 o8l'03 



60819 

 61060 



2568 

 61030 



6436 

 60816 

 61035 



. 61039 

 61041 

 61042 

 61046 

 6445 

 60817 

 C?) 



60819 

 61060 



8 



3517 



1236 

 1248 

 3534 



3643 

 3553 

 3554 

 3574 

 1286 

 1311 

 1327 

 1422 



1424 



Locality. 



Santa Isabel. California 



Mountain 'Spring, San Diego 

 County, California. 



do 



do 



Jaciunba, San Diego County, 

 California, near Monument 

 No. 233. 



.do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 

 .do. 



Nacho^ero Valley, Lower Cali- 

 fornia. 



.do. 



Campo, San Diego County, Cali- 

 fornia, near Monument No. 

 240. 



Date. 



1894. 



May 14 



....do... 

 May 15 

 May 18 



May 19 

 May 21 

 ...do... 

 May 24 

 May 19 

 May 22 

 May 24 

 June 8 



June 9 

 Jmie 8 



Sex and 

 age. 



6? ad. 

 «? ad. 



cfad. 

 d juv. 

 ?ad. 



cfad. 



cf ad. 

 S^ad. 



cf ad. 



9 ad. 



J ad. 

 e? ad. 



cf ad. 



/?ad. 

 d'ad. 



•mm. 

 137 

 149 



150 



148 

 145 

 142 

 142 

 147 

 149 

 133 

 154 



147 

 146 



Tfvm. 

 73 

 78 



mm. 

 17.0 

 16.0 



16.7 

 17.0 



17.5 

 17.0 

 17.0 

 17.0 

 17.0 

 17.0 

 16.0 

 17.5 



17.0 

 17 



mm. 



10.5 

 10.0 



10.0 



12.0 

 9.7 

 10.5 

 10.0 

 12.0 

 10.7 

 9.5 

 '10.0 



10.3 

 11.0 



a In collection of American Museum of Natural li Mammae P J, A S, I 



History, New York. e Contained 4 fetuses. 



6 Type of pallidus Rhoads. / Contained 5 fetuses, 

 c Contained 3 fetuses. 



5 = 3 pairs. 



30639— No. 56—07 m- 



-30 



