The Chonaphini 127 



Montaphe elrodi. After evaluating all the specimens cited herein, it is 

 apparent that all these genera are related and comprise a distinct 

 faunal assemblage despite the absence of a unifying anatomical feature. 

 The closest such trait is the narrowly blade-like to acicular acropodite, 

 the only exception being Montaphe paraphoena. 



The previous range description (Shelley 1990) was published 

 before field expeditions to Washington, Idaho, and Montana. The 

 specimens collected on these trips plus additional museum samples 

 reveal that the distribution in the western United States is not contiguous 

 and that a separate "finger" extends southward along the Blue Mountains 

 into Oregon from eastern Washington. Foremost among the new speci- 

 mens are the syntypes of P. armatus at the PMNH (Shelley 19936), 

 and three additional samples from Grant and Umatilla counties, Oregon 

 (WAS), which confirm the species in this range. An additional record 

 of S. placidus from eastern Ohio, shown as a solitary spot in figures 1 

 and 69, suggests that the central and eastern areas of this species may 

 eventually be connected. 



Key to Genera of the Chonaphini, based primarily on adult males. 



1. Prefemoral process short, less than half as long as acropodite 



(Figs. 54-55, 60-61, 65-66); Jackson and Curry counties, 

 Oregon, to Mendocino and El Dorado counties, California .... 



Selenocheir, new genus 



Prefemoral process longer, nearly as long as to longer than acropodite 

 2 



2. Prefemoral process generally long and slender, acicular or blade- 



like, expanding only distad if at all, with or without variable 



processes 3 



Prefemoral process broadly expanded and laminate throughout length 

 5 



3. Prefemoral process blade-like and unadorned, without projections, 



(Figs. 52-53); Latah and Benewah counties, Idaho 



Metaxycheir Buckett and Gardner 



Prefemoral process either with variably long barbules or distally 

 expanded 4 



4. Paranota variably broad and distinct throughout body; gonoster- 



num present (Figs. 34, 41); Douglas County, Washington, to 



Lake County, Montana Montaphe Chamberlin 



Paranota present on segments 1-5 only, remaining segments 

 appearing nearly julidan, with at most only ozopore swell- 

 ings (Fig. 45); gonosternum absent, coxae connected by 

 membrane only; Vancouver Island, British Columbia, to 



