The Chonaphini 135 



receptacle in some females is larger than that of the syntype, extending 

 ventrad along the lateral surface of the valves and partly enclosing 

 the operculum as well as being cupped around the anterior and caudal 

 surfaces. These receptacles are saddle or bowl-shaped, with the valves 

 situated on top in a ventral depression. 



Ecology^The specimens that I collected in Multnomah County, 

 Oregon, were wandering over the substrate in deciduous forests; those 

 from Stevens County, Washington, were under partly buried, "stuck," 

 pine and fir logs and detached pieces of bark beside a dirt driveway 

 in a predominantly pine woods; and those from Latah and Clearwater 

 counties, Idaho, on and under logs, moss, and leaves. Specimens from 

 Chelan County, Washington, were also found "active on ground." 

 Labels with preserved samples indicate that C. armata has been en- 

 countered in willow litter, under rocks and fungi, under logs near 

 streams, under rotten logs, on moist hillsides, and under cow dung. 



Distribution — Occurring in five segregated areas in the northwestern 

 United States: the lower Willamette Valley of Oregon, the eastern 

 slope of the Cascade Mountains in central Washington, the western 

 slope of the Blue Mountains, northern Idaho and western Montana, 

 and an isolated site in Stevens County, Washington (Figs. 68, 70). 

 Specimens were examined as follows: 



OREGON: Benton Co., ca. 16 mi (25.6 km) N Corvallis, Finley 

 Natl. Wildlife Ref., 7M, F, 31 March 1972, L. Russell (VMNH) and 

 2M, F, 26-28 April 1978, D. R. Breakey (WU). Polk Co., Zena, 4-H 

 Camp, M, 23 April 1983, D. R. Breakey (WU). Marion Co., 2.5 mi 

 (4.0 km) W Mehama, 4M, 2F, 30 March 1969, R. L. Westcott (UCD). 

 Clackamas Co., West Linn, MM, FF, 6 May 1972, L. Russell (VMNH). 

 Multnomah Co., Portland, 2M, 19 June 1882, L. Henshaw (MCZ); South 

 Portland, M, May 1905, J. E. Benedict (NMNH); and Columbia River 

 Gorge, Oneonta Trail between Horsetail Falls and Oneonta Gorge, M, 

 2 June 1991, R. M. Shelley (NCSM) and John B. Yeon St. Pk., along 

 trail to Elowah Falls, 4M, 3 June 1991, R. M. Shelley (NCSM). Umatilla 

 Co., jet. N and S Forks, Umatilla R., M, 6 July 1967, F. A. Coyle 

 (WAS); 3.0 mi (4.8 km) NE Gibbon, along Umatilla R., M, 7 July 

 1967, F. A. Coyle (WAS); 10.0 mi (16.0 km) E Ukiah, Bear Wallow 

 Cpgd. along OR hwy. 244, M, 7 July 1967, F. A. Coyle (WAS). Grant 

 Co., vie. of Canyon City, M, 2F, October 1871, O. Harger, G. H. 

 Collier (PMNH) TYPE LOCALITY. 



WASHINGTON: Stevens Co., along Springdale to Hunters Rd., 

 13.5 mi (21.6 km) W jet. WA hwy 231, 6M, 4F, 1 June 1993, R. M. 

 Shelley (NCSM). Chelan Co., Soda Spring, ca. 7.9 mi (12.6 km) W 



