No record of embryos is available for Washington pikas, but a male with enlarged testes was taken at Lake Keechelus, Kittitas County, on March 22, 1940. Half-grown young of fenisex were taken at Sawtooth Mountain, Skamania County, on July 13, 1939, and of brunnescens at Slate Creek, Whatcom County, on August 16, 1937. Nearly full-grown young of fenisex are reported taken at Bald Mountain, head of Ashnola River, Okanogan County, on September 16, 1920. Young cuppes of several sizes were taken at Sherman Creek Pass, Ferry County, on September 11, 1938. The breeding season possibly extends from March to August with a tendency to be earlier at lower elevations.
Ochotona princeps cuppes Bangs
Ochotona cuppes Bangs, Proc. New England Zoöl. Club, 1:40, June 5, 1899.
Ochotona princeps cuppes A. H. [Howell], N. Amer. Fauna, 47:27, August 21, 1924.
Type.—Obtained by Allan Brooks at the Monashee Divide, 4,000 feet, Gold Range, British Columbia, on August 2, 1897; type in Museum of Comparative Zoölogy.
Racial characters.—Smallest and palest of the Washington pikas; total length less than 8 inches; color of upper parts grayish-yellow, grayest on posterior third of back; underparts pale buff; skull small, but with relatively wide zygomatic and interorbital regions.
Measurements.—Eight males and 3 females from Round Top Mountain, Pend Oreille County, average, respectively: total length 183.5, 181.5; hind foot 30.7, 31.0; ear 22.4, 23.7; one adult male from the same locality weighed 141.6 grams.
Distribution.—This pika has been found at Round Top Mountain (W.W.D.) and Pass Creek Pass (W.W.D.) in northeastern Washington.
Ochotona princeps fenisex [Osgood]
Lagomys minimus Lord, Proc. Zoöl. Soc. London, p. 98, 1863 (not of Schinz, 1821).