372 CRAYFISHES. 



Cambarus sloanii Bundy. 



Four specimens, males of the second form, collected by Mr. W. P. Hay 

 between Paoli and Wyandotte, Ind. (U. S. N. M., No. 19,776), and determined 

 by Mr. Hay as C. sloanii, differ in some important regards from the types of 

 C. sloanii from New Albany, Ind.: The tip of the inner ramus of the gonopods 

 is not deflected inward so strongly, the rostrum is longer, with a longer acumen, 

 the large claws are distinctly narrower, with relatively longer fingers, and the 

 outer row of spines on the lower face of the merus of the cheliped is reduced to a 

 single terminal spine. These specimens perhaps represent a new species or sub- 

 species, but in the absence of the first form of the male and the female I refrain 

 from naming it. . 



Cambarus affinis (Say). 



Ncui localities: — Maryland: .Sam's Creek, Frederick Co. (U. S. N. M.); 

 Little Pipe Creek at Union Bridge and near New Windsor, Carroll Co. (U. S. N. 

 M.); Northwest Branch near Hyattsville, Prince Georges Co. (U. S. N. M.). 

 Virginia: Orkney Springs, Shenandoah Co. (U. S. N. M.). Massachusetts: 

 Bancroft's Pond, Brown's Pond and Spring Pond, Peabody, Essex Co. (M. C. Z.) ; 

 Mansfield Pond, Great Barrington, Berkshire Co. (M. C. Z.) ; 



This species, whose real home is in the rivers that flow into the Atlantic 

 in New Jersey, Pennsylvania, Maryland and Virginia, is now well established 

 in the town of Peabody, Essex Co., Mass. How or when it got there I do not 

 know. The first report of it came to me in 1901 when the late J. H. Sears 

 brought me a specimen 90 mm. long, which he had caught in Bancroft's Pond, 

 Peabody, on the 4th of August of that year. In Sept., 1911, Dr. John C. Phillips 

 secured a good many (43) specimens from Spring Pond, Brown's Pond and Ban- 

 croft's Pond in Peabody, some of them attaining a length of 9S mm.^ Dr. Phil- 

 lips's colle(!tor searched for crayfishes in the following ponds in Essex County 

 with negative results: — Hood's, Stephens, Four-Mile, Stiles's, Spofford's and 

 Perley Pond in Boxford, and Chebacco, Beck's, Round and tiravelly Ponds in 

 Hamilton. 



On the 14th of June, 1912, I captured a female C. affinis, with j'oung under 

 her abdomen, in Mansfield Pond, Great Barrington, Berkshire Co., Mass. 



' The largest Bpccinion of C. affinis in tlic Museum of Comparative Zoology, a female from Havre de 

 Grace, Md., No. ISO, ooUeetcd in 1854, measures 124 mm. from the tip of the rostrum to the end of the 

 telson. This is the individual figured, slightly lengthened, on Plate 5 of Hagcn's Monograph of the North 

 American Astacidae. 



