134 Rowland M. Shelley 



with irregular to lightly serrate edges, expanding again at 3/4 length 

 into broad, thickened irregularly convoluted projection on dorsal side, 

 distal extremity of stem thin and lamellate, apical margin gently concave, 

 lateral side bent strongly dorsad, lying transversely to axis, apically 

 acuminate, medial side not bent, apically rounded. Acropodite arising 

 on caudolateral side of prefemur, angling anteromediad over ventral 

 surface of prefemoral process, looping around medial surface of latter, 

 and curling onto shelf, obscured by shield, curving distad along dorsal 

 face of process to acuminate tip. 



Female syntype — Body highly fragmented, length unmeasurable, 

 maximum width 4.2 mm, D/W ratio 75.6%. Agreeing essentially with 

 males in structural details except paranota more declined, giving appear- 

 ance of slightly more vaulted body. Valves (Fig. 8) relatively large, 

 moderately hirsute, with large medial lobes protruding through mid- 

 line of aperture, subtending deep central depression. Receptacle large, 

 lightly hirsute along ventral margin, cupped around valves, extending 

 slightly more on caudal side than on anterior. 



Variation — There is considerable variation in color. The pattern 

 is generally bimaculate with colored paranota and uniformly black metaterga, 

 but two males that I collected at Elk Creek Falls Recreation Area, 

 Clearwater County, Idaho, displayed broad yellow bands, concolorous 

 with the paranotal markings, along the caudal margins of tergites 12- 

 17. The paranotal spots vary in color being white to cream-colored on 

 specimens that I encountered in Multnomah County, Oregon, reddish- 

 orange on ones from Stevens County, Washington, and bright lemon 

 yellow on ones from Latah and Clearwater counties, Idaho. 



On the gonopods, the size and degree of irregularity of the distal 

 projection from the dorsal face of the prefemoral process varies consider- 

 ably. In some males, the structure is much larger and more flattened 

 than shown in figures 4-7, becoming a second, more distal, and unprotected 

 shelf; in others, it is more irregular and convoluted, and occasionally 

 the side margins curl upwards, forming lips and demarcating a narrow, 

 elongate trough or groove. In still others, the tip of the projection 

 bends or curves laterad. The apical gonopodal margin is as shown in 

 figures 4-7 in all specimens except those from Stevens County, Wash- 

 ington, in which the entire margin, not just the lateral side, is bent 

 dorsad. As there is only one sample with this configuration, I include 

 it under C. armata, but future workers with access to more material 

 may conclude that this condition is significant enough to warrant specific 

 recognition. 



In females, the size of the medial projection of the valves varies, 

 some being very large and overshadowing the rest of the valves. The 



