Males having vocal slits; dorsum vermiculate; diameter of tympanum in males about one-half diameter of eye _S. [Please select]
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Within the type-series, the pattern varies from weakly to strongly vermiculate but is always recognizable as vermiculate rather than spotted as in _S. [Please select]
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This species, in summer, is more grayish than the Rock Ptarmigan, and is very finely vermiculated with blackish. [Please select]
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A grayish species with the back and underparts finely vermiculated with reddish brown, and with streaks of darker. [Please select]
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Alula and primary-coverts blackish; lesser wing-coverts blackish, broadly margined with green; middle coverts with less green and vermiculated with white. [Please select]
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Greater coverts and secondaries blackish vermiculated with white, the former narrowly edged with green, the secondaries only very faintly. [Please select]
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_ Ground color of upperparts deep umber-brown, very finely and densely vermiculated; chest barred with bright tawny brown and black. [Please select]
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Wing-coverts finely vermiculated; tail coppery tipped with black; outer web and end of outer feathers white, mottled with black. [Please select]
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Dorsum vermiculate; interorbital bar present; ground color cream to brown in life _S. [Please select]
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_ Above, breast and flanks raw umber finely vermiculated with black on back; with black blotches on head, neck and upperpart of back and wings. [Please select]
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Above drab, back tinged with pinkish rusty and faintly vermiculated with reddish brown; breast paler ashy faintly suffused with pinkish or rusty; belly whitish; underparts finely barred with reddish brown and streaked with clove-brown. [Please select]
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