20 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 123 



Cambarus bartonii bartonii (Fabricius) 



Figure 2 



Astacus bartonii Fabricius, 1798, p. 407. 



Astacus (Ca?nbarus) bartonii Erichson, 1846, p. 97. 



Cambarus bartonii Girard, 1852, p. 88. 



Cambarus bartonii bartonii Faxon, 1890, p. 622 [by implication]. 



Diagnosis. — Margins of rostrum subparallel or slightly convergent 

 to base of acumen where suddenly contracted (but rounded), thickened 

 but without marginal spines; areola never more than six, usually 

 four or five, times longer than broad with widely spaced punctations ; 

 suborbital angle usually acute. Chela with subovate fingers bearing 

 distinct median longitudinal ridges on upper surfaces; fingers may be 

 slightly gaping but never provided basally with conspicuous tuft of 

 setae; inner margin of palm with single row of tubercles, occasional 

 specimens with trace of second row or few scattered tubercles. 



Range. — From New Brunswick, Canada, to northern Georgia; in 

 the southeast mostly in the mountains and piedmont. 



Specimens examined. — Approximately 1200 specimens in 97 

 collections from 87 stations. Unquestionably this species is more 

 widespread in this area than any of the others for it is found in all 

 three drainage systems and at altitudes from 1219 to 427 m. It 

 was found at all stations except 11, 13, 15, 18, 20, 27, 30, 31, 33, 

 40-43, 55, 56, 58, 61, 62, 65, 67, 70, 72, 73, 75, 78-81, 84, 86, 88, 102, 

 104-106, 109, 112, 116, 126, and 127. 



Associates. — In the James and Roanoke drainages it was as- 

 sociated with C. I. longulus at stations 6, 7, 9, 10, 12, 21-23, 25, 29, 

 32, 34, 35, 37, 89-93, 123, 124; with C. acuminatum at 29, 32, 35, 87, 

 89-93; and with 0. juvenilis at 7. In the New River drainage it 

 was associated with C. sciotensis at Stations 3, 5, 19, 44, 50, 54, 57, 



59, 63, 64, 66, 95-97, 107, and 108. 



Ostracod associates include An. ancyla at stations 89, 92, 93; Dn. 

 ardis at 10, 12, 21, 23, 25, 32, 35, 37, 123, 124; Dn. ileata at 3-10, 

 12, 14, 16, 19, 21-26, 28, 29, 32, 34, 35, 37, 44-48, 50-52, 54, 57, 59, 



60, 63, 64, 66, 69, 71, 74, 76, 77, 94-99, 107, 108, 110, 113, 117, 119, 

 122-125; Dn. scalis at 1, 2, 7, 17, 38, 39, 44, 68, 82, 83, 100, 101, 

 103, 114, 115; Dn. truncata at 53, 54, 57, 69, 71, 87, 90, 91, 93, 94, 

 111; Dt.falcata at 85, 87, 89-93, 111; Dt. suteri at 35, 124; E. inter- 

 notalus at 23, 35, 90; E. kanawhaensis at 44; and P. phyma at 3, 

 5, 7, 24, 38, 44, 64, 82, 101, and 103. 



Branchiobdellid associates include A. koronaeus at stations 14, 19, 

 29, 52, 69, 71, 77, 87, 89-93, 98, 110, 111, 125; B. illuminatus at 5, 

 16, 17, 19, 22, 34, 44, 45, 48, 51, 59, 68, 76, 87, 97, 115, 120-122, 

 125; C. branchiophila at 24, 29, 34, 57, 63, 66, 87, 89-93, 97; C.jallax 



