The Chonaphini 185 



the lateral termination is absent, and the medial one arises from an 

 otherwise flat surface. 



Female paratype — Length 35.1 mm, maximum width 5.2 mm, 

 W/L ratio 14.8%, D/W ratio 71.2%. Agreeing closely with males in 

 somatic features except paranota more strongly declined, creating appear- 

 ance of more highly arched body. Cyphopod aperture with sides and 

 caudal margin elevated above metazonal surface, former leaning inward 

 over opening, latter rising to peak in midline. Cyphopods in situ 

 lying transversely in aperture, common surface visible in opening. 

 Valves (Fig. 63) relatively small, subequal, situated nearly entirely 

 on top of receptacle, without lobes, moderately hirsute. Receptacle 

 very large, alate, situated to medial side but still nearly directly beneath 

 valves and nearly enveloping latter, extending well up both anterior 

 and caudal valvular surfaces, anterior "wing" larger than caudal, ex- 

 tending nearly completely up side of anterior valve, with numerous 

 long hairs arising from sides and ventral margins. Operculum relatively 

 small, closely appressed to lateral surface of valves. 



Variation — The non-typical male from Tehama County and that 

 from Mendocino County have a slight bisinuate stretch instead of the 

 uncinate curve (Fig. 62), and the prefemoral process expands distad 

 and terminates in a central point. There is no suggestion of bifuration; 

 the distal expansion imparts a general clavate shape to the structure. 

 In the males from Humboldt County, the acropodite is directed strongly 

 submediad. 



Ecology — Unknown; the vial labels do not provide habitat 

 information. The sample from Dead Mule Spring was at an altitude of 

 about 5,150 ft; those from Lake County were collected at 3,910 ft. by 

 ultraviolet light. 



Distribution — The northern Sacramento Valley and Coast Range 

 of California, an area of about 84 mi (134 km) east/west and 119 mi 

 (190 km) north/south. Specimens were examined as follows: 



CALIFORNIA: Tehama Co., Black Rock Camp along Mill Cr., 

 18.8 mi (30 km) NE Red Bluff, lOM, 2F, 15 May 1972, C. Smith, J. 

 Clover, F. Ennik (UCD) TYPE LOCALITY; and Dead Mule Spring, 

 along unnamed rd., 2 mi (3.2 km) N Paskenta/Covelo rd., M, F, 29 

 August 1972, H. B. Leech (CAS). Mendocino Co., 6 mi (7.6 km) N 

 Potter Valley, M, 28 January 1967, J. S. Buckett, M. R. Gardner 

 (UCD). Humboldt Co., 5 mi (8.0 km) N Willow Creek (town), Tish 

 Tang Rec. area, 5M, 21 February 1976, and 2M, 3F, 20 December 

 1979, A. K. Johnson (NCSM). Lake Co., nr. clear Lake, N side Bartlett 



