128 Rowland M. Shelley 

 Jefferson County, Washington 



Tubaphe Causey 



5. Prefemoral process upright, without distal hairs; distal part of 

 acropodite inserting onto narrow shielded ledge on pre- 

 femoral process (Fig. 47); King and Chelan counties, 

 Washington, to Grant and Coos counties, Oregon, and 



Missoula County, Montana 



Chonaphe Cook 



Prefemoral process bent abruptly dorsad at 1/3 length, with dense 

 distal hairs on inner and apical margins, without ledge; acro- 

 podite usually lying parallel to prefemoral process (Figs. 



30-31); southeastern Minnesota to westcentral Virginia 



Semionellus Chamberlin 



Genus Chonaphe Cook 

 Chonaphe Cook, 1904:56. Attems, 1931:65; 1938:155-156. Chamberlin 



and Hoffman, 1958:27. Jeekel, 1971:253. Hoffman, 1979:157. 



Kevan, 1983:2968. 



Type species — Polydesmus armatus Harger, 1872, by original 

 designation. 



Diagnosis — Paranota present and variably distinct on all segments; 

 epiproct without constriction; gonocoxae widely segregated by narrow 

 sternal band, latter with lateral lobes; telopodal elements not parallel, 

 arising proximad on prefemur; prefemoral process long, expanded and 

 laminate, elaborately ornamented, with shielded ledge or shelf near 

 midlength on dorsal surface; acropodite acicular, passing through numer- 

 ous vertical planes, looping around prefemoral process and curling 

 onto shelf; cyphopod valves with medial corners usually prolonged 

 ventrad, subtending central cavity. 



Description — A genus of moderately large to large chonaphine 

 Xystodesminae with the following characteristics: 



Body composed of head and 20 segments in both sexes, essentially 

 parallel sided, tapering at both ends. 



Head of normal appearance, smooth, polished. Epicranial suture 

 faint or distinct, terminating above interantennal region. Antennae 

 relatively short and broad, becoming progressively more hirsute distad, 

 with 4 conical sensory cones on ultimate article, no other sensory 

 structures apparent. Genae not margined laterally, with faint or distinct 

 central impressions, ends narrowly rounded and extending just beyond 

 adjacent cranial margins. Facial setae with epicranial, interantennal, 

 frontal, genal, clypeal, and labral series present, with or without supra- 

 antennal and subantennal series. 



