294 



VERTEBRATE AXIMALS OF THE UXITED STATES 



R. Ji. hiimiilis (x\ud. and Bach.). Ear 9 to 10 mm. long: coastal 

 plain from Virginia to central Florida. 



R. h. impiger (Bangs). Ears smaller: mountains of northern 

 Virginia and West Virginia. 



R. h. merriami (Allen). Ears smaller; under parts darker: central 

 Kentucky to central Alabama and westward to the east Texas coast. 

 R. albescens Gary. Color very pale; length 125 mm.'- 

 South Dakota to central Texas. 



R. megalotis (Baird) (Fig. 161). Western harvest 

 mouse. Color brownish buff on the back and buff on the 

 sides; white beneath and on the feet; length 140 mm.; tail 

 65 mm.; hind foot 17 mm.; ear 12 mm.: western States to 

 the Pacific; southward into Mexico. 



1 



Subspecies of R. megalotis 



R. m. megalotis (Baird). Southern Idaho southward 

 to eastern California and the Mexican border, then east- 

 ward to southwestern Texas. 



R. m. aztecus (Allen). Ears and skull larger: northern 

 New Mexico, northeastern Arizona, southeastern Utah 

 and western Colorado. 



R. m. dychei (Allen). More black on the upper parts; 

 tail shorter: eastern Iowa and Missouri to central Colorado 

 and Wyoming; northward to North Dakota and Montana. 

 R. m. nigrescens Howell. More blackish: eastern 

 Washington, Oregon and northern California and western Idaho. 



R. m. longicaudus (Baird). Colors darker; length 145 mm.; tail 

 75 mm.; hind foot 17 mm.: western California, west of the Sierras. 



R. catalince Elliot. Similar to R. m. longicaudus, but larger; length 

 169 mm.; tail 94 mm.: Santa Catalina Island. 



R. raviventris Dixon. Upper parts very dark; under parts pinkish; 

 length 130 mm.; tail 64 mm.; hind foot 16 mm.: salt marches of San 

 Francisco Bay. 



Fig. 162.— 

 Reithrodon- 

 tomys humulis 

 {after Stone 

 cr= Cram). 



Subspecies of R. raviventris 



R. r. raviventris Dix. Southern part of San Francisco Bay. 



R. r. halicoetes Dix. Size larger; length 156 mm.; under parts white: 

 salt marshes of San Pablo, Suisun Bay and the lower San Joaquin and 

 Sacramento Rivers. 



