Abstract
The neinatodes described in this paper were collected from Figgins' pika, Ochotona princeps figginsi (Allen) in the summer of 1947 at the Rocky Mountain Biological Laboratory near Crested Butte, Gunnison County, Colorado. The pikas, sometimes referred to as rabbits or conies, were taken fromn rock slides at elevations of 9,500 feet and above. Of 27 pikas examined by the writer and other students at the laboratory (namely George W. Kelley, Gerald K. Menzie, and John W. McDowell), 14 contained nematodes in the stomach. The number present varied from 1 to 15, the average number being 6. The specimens were killed in hot 70a/c alcohol and cleared in lacto-phenol solution. Glycerine, even when added very gradually, caused collapse of the body wall. The study was made under the direction of Dr. H. W. Manter, whose helpful suggestions are gratefully acknowledged. The nemnatodes are members of the family Trichostrongylidae Leiper, 1912 and may be placed within the sub-family Graphidiinae Travassos, 1937 on the basis of the location of the vulva near midbody, the divergent uteri, the ending of the tail of the female in a single, simple point, the filiform spicules, and the gericral arrangement of the bursal rays.
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