MAMMALS OF THE MEXICAN BOUNDAEY, 



465 



Remarks. — In the series of aboul 70 specimens before tne from the 

 Pacific section of t he boundary strip (Mountain Spring to San Diego), 

 l)ii) little 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 R. longicauda and Rhoads's 



Fig. in;.- Reithrodontomys longicauda. Skull, a, dorsal view; 6, ventral view; c, lateral 



VIEW. 



R. pallidas. 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 May and June. 



Record and measurements of 60 specimens of Reitli rodontom ys longicauda. 



Museum num- 

 ber. 



03289 

 61030 



o8079 

 60816 



i, in.;., 



61039 

 61041 

 61042 

 61046 

 O8089 

 60817 

 O8103 

 60818 



60819 

 61060 



2568 



cm: in 



6436 

 60816 

 61035 



61039 

 61041 

 61042 

 61046 

 6 1 15 

 60817 

 C?) 



COS is 



60819 

 61060 



3517 



1236 

 1248 

 353 1 



35 13 

 3553 



355 1 

 357 1 

 1286 



l.'.ll 



1327 



1 122 

 1424 



Locality. 



Santa Isabel.. California. 



Mountain Spring, San 

 County, ( alifornia. 



....do 



....do 



Date. 



I Sill. 



Sex and 



Jacumba, San Diego County, 

 California, near Monument 

 No. 233. 



....do 



....do 



....do 



....do 



....do 



.do ." 



....do 



Diego May 11 



...do... 



May 15 



May 



Nachoguero Valley, Lower I ali- 

 fornia. 



do 



Campo, San Diego Countj . I ali 

 fornia, near Monument No. 

 240. 



is 



May L9 



May 21 

 ...do.. 



Maj 24 



May 111 



Mas 22 



May '-'1 



June 8 



June 

 June 



a in collection of American Museum of Natural rf Mammae I 



History, New York. • i Contained 



pe of pallidus Rhoads. / Contained 

 ■ i ontaine I 3 fe1 u 



30639 No. 56—07 m 30 



'< ; ad. 

 c , ad. 



f ad. 



' juv. 



5 ad. 



' ad. 



o* ad. 

 d , ad. 



f ad. 



?ad. 



' ad. 

 - ad. 



f ad. 



/ j ad. 

 f ad. 



i fetuses. 



10.5 

 10. 



10.0 



12.0 

 9.7 



in.:, 

 10.0 

 12.0 

 10.7 

 9. 5 

 lo.o 



10.3 



11.0 



:: pairs. 



