190 



Rowland M. Shelley 



Fig. 69. Distributions of the Chonaphini, Semionellus, and S, placidus 

 in the eastern United States. Open symbols denote literature records 

 considered accurate. 



strongly submediad on the coxa. These traits approximate those diagnostic 

 for the Harpaphini (Shelley 1993^). 



DISTRIBUTION 



Species and genera — As shown in Figure 70, the western chonaphine 

 species occupy mutually exclusive ranges, segregated from each other, 

 aside from the region in and around Idaho, where C. armata and 

 Montaphe elrodi overlap broadly; the former also overlaps Metaxycheir 

 prolata, and the latter completely envelops C. schizoterminalis. The 

 sympatry in California between S. sinuata and arcuata may be an 

 artifact because so few records are available from the Coast Range in 

 Lake, Mendocino, Trinity, and Humboldt counties. The northernmost, 

 Humboldt County, population of S. arcuata may be allopatric and 

 detached from the rest of the species, which occurs generally to the 

 south-southwest of S. sinuata. I have assumed that these populations 

 connect, which accounts for the range overlap with S. sinuata; if they 

 do not overlap, S. arcuata and sinuata are parapatric. Both S. sinuata 

 and Montaphe elrodi show southward projecting fingers from their 



