. Fig. 32. Distribution of Ochotona princeps in Colorado. 1. O. p. figginsi. 2. O. p. incana. 3. O. p. saxatilis. For explanation of symbols, see p. 9. from Gunnison County. Dice (1927) detailed problems of maintaining pikas in captivity, and F. W. Miller (1939) described a tech- nique for capturing the animals alive. The subspecies of Ochotona princeps were revised by A. H. Howell (1924). This revi- sion is generally followed in the accounts of subspecies below, although a new assessment of geographic variation over the range of the species is needed. Where adequate samples are available for
. Fig. 32. Distribution of Ochotona princeps in Colorado. 1. O. p. figginsi. 2. O. p. incana. 3. O. p. saxatilis. For explanation of symbols, see p. 9. from Gunnison County. Dice (1927) detailed problems of maintaining pikas in captivity, and F. W. Miller (1939) described a tech- nique for capturing the animals alive. The subspecies of Ochotona princeps were revised by A. H. Howell (1924). This revi- sion is generally followed in the accounts of subspecies below, although a new assessment of geographic variation over the range of the species is needed. Where adequate samples are available for comparison, subspecies are seen to differ principally in cranial dimensions. There is considerable variation in external measurements, but pikas are difficult to meas- ure, and some of the variation must be as- scribed to error by collectors and differences in technique. Color has been used extensively in subspecific descriptions, but variation in color of pikas is particularly refractory to analysis because of the complexity of the molt and the patent tendency of the hairs to rapid wear. Thus, assignment of individual speci- mens to subspecies on the basis of color is necessarily rather arbitrary and even series of specimens may be difficult to allocate with any degree of confidence. Ochotona princeps figginsi J. A. Allen Ochotona figginsi J. A. Allen, Bull. Amer. Mus. Nat. Hist., 31:103, 28 May 1912; type locality, Pa- goda Peak, Rio Blanco Co., Colorado. Ochotona princeps figginsi, A. H. Howell, N. Amer. Fauna, 47:21, 21 August 1924. Distribution in Colorado.—Mountains and high plateaus of western part of state, from Park Range southward to Elk and West Elk mountains (Fig. 32). Comparisons.—From O. p. saxatilis, the subspecies of the Front Range, O. p. figginsi differs in slightly smaller average external and cranial size, and in generally darker, more vinaceous color in summer pelage. For ex- tended comparison, see Henderson and Cock- erell(1913). From O. p. nigrescens,
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