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KEY TO THE GROUND SQUIRRELS OF CALIFORNIA.

Table of Contents

1. Size large: body alone more than 9 inches (228 mm.) long; tail more than 6 inches (152 mm.), not counting hairs; ears tall and rather pointed; tail bushy.

2. A blackish brown wedge-shaped patch on middle of back between shoulders Douglas Ground Squirrel (p. 52).

2'. No blackish patch on back.3. Tail longer: without hairs, about 8 inches (203 mm.); no sharply defined triangular whitish patch on each shoulder Rock Squirrel (p. 58).

3'. Tail shorter: without hairs, 7½ inches (190 mm.) or less; a more or less sharply defined triangular whitish patch on each shoulder.4. Size larger: body alone more than 10¾ inches (273 mm.) long; general tone of coloration darker Catalina Island Ground Squirrel (p. 49).

4'. Size smaller: body alone less than 10¾ inches (273 mm.); general tone of coloration lighter.5. Coloration pale in general tone, near light cinnamon-drab; shoulder patches clear silvery white and more extensive Fisher Ground Squirrel (p. 44).

5'. Coloration somewhat darker, near wood brown; shoulder patches duller white and less extensive California Ground Squirrel (p. 9).

1'. Size medium or small: body alone less than 9 inches (228 mm.); tail less than 6 inches (152 mm.), not bushy; ears low and rounded, or else reduced to mere rims.

6. Body with conspicuous lengthwise stripes; coloration varied.7. One white stripe on each side of body; under side of tail conspicuously white; head not more or less yellowish or coppery.8. Smaller: body alone 6 inches (152 mm.) or less; general coloration grayish drab Desert Antelope Ground Squirrel (p. 94).

8'. Larger: body alone 6¼ inches (158 mm.) or more; general coloration light clay color.9. Size slightly greater; tone of color slightly darker, more deeply clay color Nelson Antelope Ground Squirrel (p. 103).

9'. Size slightly less; tone of color slightly paler, more buffy Los Baños Antelope Ground Squirrel (p. 110).

7′. Three stripes on each side of body, one white and two black; head more or less yellowish or coppery.10. Tail longer: without hairs, about 3½ inches (89 mm.).11. Tone of coloration lighter; middle of back more of an ashy brown Inyo Golden-mantled Ground Squirrel (p. 89).

11'. Tone of coloration darker; middle of back more of a cinnamon-brown Sierra Golden-mantled Ground Squirrel (p. 83).

10'. Tail shorter: without hairs, about 3⅛ inches (79 mm.) San Bernardino Golden-mantled Ground Squirrel (p. 92).

6'. Body without any stripes: general coloration nearly or quite uniform.12. Size larger: body alone more than 7 inches (178 mm.).13. Larger: body about 8½ inches (216 mm.); middle of back not bright reddish-brown, but grayish-brown Oregon Ground Squirrel (p. 59).

13'. Smaller: body about 7+45 inches (198 mm.); middle of back bright reddish-brown Belding Ground Squirrel (p. 67).

12'. Size smaller: body alone less than 7 inches (178 mm.).14. Tail round and relatively long: over 3 inches (76 mm.).15. Tone of coloration paler, light pinkish-cinnamon Yuma Round-tailed Ground Squirrel (p. 76).

15'. Tone of coloration darker, wood brown Death Valley Round-tailed Ground Squirrel (p. 80).

15". Tone of coloration medium, grayish-brown or avellaneous Palm Springs Round-tailed Ground Squirrel (p. 81).

14'. Tail flat-haired and relatively short: under 3 inches (76 mm.).16. Under side of tail pinkish-buff; rim of ear distinct though low Stephens Soft-haired Ground Squirrel (p. 73).

16'. Under side of tail white; rim of ear scarcely discernible above general surface of head Mohave Ground Squirrel (p. 75).

Note.—Figures indicating page numbers refer to folios at foot of pages.

Natural History of the Ground Squirrels of California

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