CRAYFISHES. 391 



Cambarus bartonii asperimanus, subsp. nov. 



Even as these pages are going to press, two specimens of a peculiar, 

 new race of C. bartonii are sent to me from the U. S. National Museum, — males 

 of the first form, collected by Messrs. P. C. Standley and H. C. Bolman in 

 Flat Creek, near Montreat, Buncombe Co., N. C, Sept. 1, 1913. C. bartonii 

 bartonii was also collected at the same time and place. The new form is conspicu- 

 ously different from any previously known race of C. bartonii in having scattered 

 coarse setae upon the chelae, which are moreover deeply and coarsely pitted, 

 with a tendency toward corrugation; the inner border of the propodus is fur- 

 nished with a cristiform row of from five to seven teeth; the dorsal face of the 

 carapace is extremely smooth and shows hardly a trace of the customary pits 

 or impressed dots except a row along the margin of the rostrum; even on the 

 areola the dots are scarcely visible without high magnification; finally, the ante- 

 rior process of the epistoma is broadly truncate in front. 



Such are the diagnostic characters of this sub-species, which in other regards 

 agrees pretty closely with typical C. bartonii. The hooks of the third segment 

 of the third pair of legs are acute and attenuated at the tip. 



Length, 54 mm., carapace, 27 mm.; chela, 19 mm. Type, U. S. N. M., No. 

 47,375. 



Cambarus bartonii acuminatus Faxon. 



Cambarus acuminahis Faxon, Proc. Amcr. Acad., 18S4, 20, p. 113. 



Neio localities: — Maryland: Northwest Branch, Hyatts\alle, Prince 

 George's Co. (U. S. N. M.) ; Indian Creek, Beltsville Prince George's Co. (U. S. 

 N. M.); North Carolina: Halifax, HaUfax Co. (U. S. N. M.). 



As noted above under Cambarus bartonii robustus, specimens from Fredericks- 

 burg, Va. (M. C. Z., Nos. 3,615, 3,797) approach closely to the form acuminatus 

 and seem to exemplify a transition from robustus to acuniinatus. 



Cambarus bartonii laevis, .subsp. nov. 



This form of C. bartonii differs from the typical race in having the carapace 

 smoother and less conspicuously punctated, the posterior section proportion- 

 ately longer, being ecjual in length to the distance from the cer\'ical groove to 

 the root of the eye-stalks; this lengthening of the hind section of the carapace 

 involves a long areola which is also not merely relatively but also absolutely 



