46 
22. BLACK RAT. Epimys rattus. 
Earliest in introduction, but kept reduced in numbers by the 
stronger Brown Rat. 
23. ROOF RAT. Epimys rattus Nlesaridiiith 
Introduced. -Has not become numerous. 
24. HOUSE MOUSE. Mus musculus. 
Introduced. Abundant. 
25. GRASSHOPPER MOUSE. Onychomys torridus. 
Found in valleys on the eastern slope of the mountains, but 
nowhere common. 
26. RAMONA GRASSHOPPER MOUSE. .Onychomys 
torridus ramona. 
Found on the mesas and in valleys of the coast region. Not 
common. Food is insects with some flesh and seeds. 
27 GAMBEL WHITE-FOOTED MOUSE. Peromyscus 
maniculatus gambeli. 
Common throughout the county. Most abundant in the pine 
forests. Not often troublesome in dwellings. 
28. SONORA WHITE-FOOTED MOUSE. Peromyscus 
maniculatus sonoriensis. 
The paler desert form. Common in the eastern part of the 
county 
29, ROWLEY MOUSE. Peromyscus boylii rowleyi. 
A mountain species. Common locally. 
30. SAN PEDRO MARTIR MOUSE. Peromyscus truei 
martirensis. 
Found in the foothills and mountains. Seldom common. 
31. CHEMISAL MOUSE. Peromyscus californicus insignis. 
Found in thick brush from the lower edge of the pine forests 
to the sea. Common. 
32. DESERT MOUSE. Hermit Mouse. Peromyscus eremicus. 
Abundant in parts of the Colorado Desert and on the eastern 
slope of the mountains, principally in valleys. 
32a. DULZURA MOUSE. Peromyscus eremicus fraterculus. 
Rather common in brushy localities from the western slope 
of the mountains to the sea. 
33. STEPHENS CANON. MOUSE. Peromyscus crinitus 
stephensi. 
Rare this far south, Found in cafions and valleys on, the 
east slope. . 
34. LARGE-EARED HARVEST MOUSE. Reithrodontomys 
megalotis. : 
Occurs in grassy places and weed patches in valleys on the 
eastern slope of the mountains and along the edge of the. desert. 
$5. LONG-TAILED HARVEST MOUSE. Reithrodontomys 
longicaudus. 
Abundant in grass and weeds in the mountains and west to 
the seacoast. 
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