The Chonaphini 177 



along medial surface of latter and crossing to lateral side at base of 

 acropodite, crossing back to inner surface, or continuing along outer, 

 to terminal opening. 



Cyphopodal aperture broad, encircling 2nd legs, sides and caudal 

 margin elevated above metazonal surface, latter rising to peak in 

 midline. Cyphopods in situ with valves oriented transversely in aperture, 

 common surface visible in opening. Valves variable in size, subequal 

 or anterior valve slightly larger, without distinct lobes or cavities, 

 situated nearly entirely on top of (ventral to) receptacle. Latter large, 

 alate, cupped around valves, more so on anterior side, with long hairs 

 arising from ventral margin. Operculum small to large, located laterad 

 to valves, with numerous long hairs. 



Distribution — From Curry and Jackson counties, in southwestern 

 Oregon, to Mendocino and El Dorado counties, California, in the 

 northern Coast Range, the northern Sacramento Valley, and the Sierra 

 Nevada foothills, an area of about 176 mi (282 km) east/west and 273 

 mi (437 km) north/south. 



Species — Three are currently recognized. 



Remarks — The Chonaphini is the best placement for this genus, 

 as the only other option is a new tribe. It displays narrowly blade-like 

 to acicular acropodites that are similar to those of Tubaphe and Metaxycheir, 

 and shares the absence of a sternum with Tubaphe. The short prefemoral 

 process is plesiomorphic, and Selenocheir tends to bridge the anatomical 

 gap between the Chonaphini and Harpaphini in having a larger coxa 

 in relation to the overall bulk of the telopodite, and in the anteromedially 

 directed acropodites, particularly in S. directa, reminiscent of the 

 condition in Isaphe (Shelley 1993t/). 



Key to Species of Selenocheir, based on adult males. 



1. Acropodite subtending very broad, poorly defined arc, without 



distinct distal curvature (Figs. 60-61); Tehama to Humboldt 



and Mendocino counties, California arcuata, new species 



Acropodite curving definitely downwards or dorsad distally, with 

 relatively distinct distal curve or bend 2 



2. Distal part of acropodite, distal to distal curve/bend, variably 



sinusoid (Figs. 54-57); Shasta to Mendocino and El Dorado 



counties, California sinuata, new species 



Distal part of acropodite without trace of sinusoid pattern (Figs. 

 65-66); Curry and Jackson counties, Oregon, to Del Norte 

 County, California directa, new species 



