384 CRAYFISHES. 



Simonds's Pond, Franklin Co. (M. C. Z.) ; Three-Mile Creek, Oswego, Oswego 

 Co. (U. S. N. M.). Virginia: Broad Run and Gap Run, Fauquier Co. (U. 

 S. N. M.); Orkney Springs, Shenandoah Co. (U. S. N. M.); Stony Man Mt.j 

 3000 ft., Madison Co. (U. S. N. M.); Peaks of Otter, 2600 ft., Bedford Co. 

 (U. S. N. M.). West Virginia: West Branch of Potomac River, 5 niiles west 

 of Circleville, Pendleton Co. (U. S. N. M.) ; Rich Creek, Spanishburg, Mercer 

 Co. (U. S. N. M.); Truljie's Run, 7 miles above Buckhannon, Upshur Co. 

 (U. S. N. M.). North Carolina: Looking-Glass Creek, Transylvania Co., 

 3300 ft. (U. S. N. M.); near Montreat, Buncombe Co. (U. S. N. M.). Ten- 

 nessee: 7 miles northwest of Chattanooga, Hamilton Co. (U. S. N. M.); 

 Little River, a tributary of the Tennessee River at Cade's Cave (U. S. N. M.). 

 The Barton's Crayfish of Aroostook County in Northern Maine (of which 

 there is a large collection in the United States National Museum from the 

 AUegash River a little Iselow Chamberlain Lake, Churchill Lake, Eagle or 

 Heron Lake, Crosslake Throughfare, and Bean Lake, St. Francis River) is a 

 small, clean form that in these clear, cool, northern waters shows a slight 

 differentiation from the typical C. bartonii from the Middle States. The 

 rostrum is more strongly decurved and the fingers are narrower and more cylin- 

 drical and gape \videly at the base. The differences between this form and the 

 type nevertheless do not seem to be great enough or constant enough to warrant 

 a subspecific separation. •■ '■ "^ 



Cambarus bartonii carinirostris Hay MS., subsp. nov. " 



"Rostrum of medium length, very broad, nearly plane or slightly excavated 

 aliove and with a more or less distinct, median, longitudinal carina; acumen 

 short, broad, with concave sides, its tip strongly upturned. Carapace with a 

 spinulose angle below the eye; branchiostegian spine obsolescent; areola of 

 moderate width. Telson bi- or tri-spinose on each side. Antennae, when 

 extended backward, reaching beyond the middle of the abdomen. Chelipeds 

 stout and heavy, chelae broad and strong, heavily punctate above and below; 

 inner margin of hand obscurely serrato-denticulate ; fingers usually gaping at 

 the base, strong down curved, pitted in lines, upper surface heavily ribbed. 

 Otherwise essentially the same as typical C. bartonii. 



"This form, which I regard as a well-marked subspecies, is in typical ex- 

 amples very like C. bartonii in general, but different in the following regards: — 

 the carapace is a little more cyUndrical, the rostrum broader and flatter, and 



