CRAYFISHES — HOBBS, HOLT, AND WALTON 



37 



penis greater than half that of clasping apparatus. Female without 

 J-shaped rod or amiculum but with small corneous tube directed 

 ventrally or posteroventrally in corresponding position; claws of 

 second antenna simple. 



Donnaldsoncy there ardis Hobbs and Walton 



Figure 86 



Donnaldsoncythere ardis Hobbs and Walton, 1963, pp. 364-368, figs. 6-9, 10, 26. 



Diagnosis. — Copulatory complex with peniferum terminating 

 ventrally in conspicuously slender, pointed extension; clasping 

 apparatus only slightly curved along shaft, not divisible into vertical 



Figure 8. — Penifera of entocytherids: a, Ascetocythere asceta; b, Donnaldsoncythere ardis; 



c, Dn. ileata. 



and horizontal rami, distal portion slightly enlarged and directed 

 anteroventrally, internal border with two teeth and apical border 

 with four serrations. 



Range. — The James River drainage in Craig, Giles, and Mont- 

 gomery Counties, Va. 



Specimens examined. — Approximately 175 specimens from 18 

 collections in the following stations: 10-13, 20, 21, 23, 25, 27, 30-33, 

 35, 37, 123, and 124, at elevations from 402 to 622 m. 



Hosts and associates. — Donnaldsoncythere ardis was associated 

 with Cambarus I. longulus in all stations; with C. b. bartonii at stations 

 10, 12, 21, 23, 25, 32, 35, 37, 123, 124; and with C. acuminatus at 20, 

 27, 30-33, and 35. 



