MAMMALS OF THE MEXICAN BOUNDARY. 



465 



RemarJtS. — In the series of about 70 specimens »bef ore nie from the 

 Pacific section of the boundary strip (]\Iountain Spring 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 R. longicauda and Rhoads's 



Fig. 116.— Reithrodontomys longicauda. 



Skull, a, dorsal view; b, ventral view; c, lateral 



VIEW. 



R. paTLidus. 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 durins: May and June. 



Record and measurements of 60 specimens of Reithrodontomys longicauda. 



Museum num- 

 ber. 



a3289 

 610.30 



18079 

 60816 

 610:35 



610:i9 

 61041 

 610-12 

 61046 

 a80S9 

 60817 

 "8103 

 60818 



60819 

 61060 



2568 

 61030 



6436 

 60816 

 61035 



61039 

 61041 

 61042 

 61046 

 6445 

 60817 

 (?) 

 60818 



60819 

 61060 



3517 



1236 

 1248 

 3534 



3543 

 3553 

 35.54 

 3574 

 1286 

 1311 

 1327 

 1422 



1424 

 3631 



Locality. 



Santa Isabel. California 



Moimtain Spring, San Diego 

 Comity, California. 



do.., 



do 



Jacum))a, San Diego Coimty, 

 California, near Monument 

 No. 233. 



do 



do 



do 



do 



do 



do 



do 



Nachoguero Valley, Lower Cali- 

 fornia. 



do 



Campo, San Diego Comity, (Cali- 

 fornia, near Monument No. 

 240. 



Date. 



May 14 



...do... 

 May 15 

 May 18 



May 19 

 May 21 

 ....do... 

 May 24 

 May 19 

 May 22 

 May 24 

 June 8 



.Time 

 June 



6? ad. 

 c? ad. 



cT ad. 

 d juv. 

 9 ad. 



cT ad. 



cfad. 

 d?ad. 



cf ad. 



$ad. 



c?ad. 

 e? ad. 



d ad. 



/$ad. 

 J ad. 



a In collection of American Museum of Natural d Mamma- P. }, A. g, I. 



History, New York. e Contained 4 fetuses. 



b Type of pallidum Rhoads. / Contained 5 fetuses, 

 c ContaineJ 3 fetuses. 



mm. 

 137 

 149 



150 



148 

 145 

 142 

 142 

 147 

 149 

 133 

 1.54 



147 

 146 



mm. 

 73 



78 



W 



17.5 

 17.0 

 17.0 

 17.0 

 17.0 

 17.0 

 16.0 

 17.5 



17.0 

 17 



5 = 3 pairs. 



H 



mm. mm. 



17.0 ' 



16.0 t 10.5 



16.7 10.0 



12.0 

 9.7 

 10.5 

 10.0 

 12.0 

 10.7 

 9.5 

 10.0 



10.3 

 11.0 



30r339--No. 56—07 M- 



-30 



