112 A HE VISION OF THE ASTACID^. 



VAR. obscura. 



Camburit* otecuriu, HAGEN, 111. Cat. Mus. Comp. Zoul., No. III., p. 69, PI. I. figs. 72-75, PI. III. fig. 154, 



1870. 

 '..inix obscurus, SMITH, Rep. U. S. Comm. Fish aud Fislieries for 1872 and 1873, p. 639, 1874. (After 



llai,Tn. No description.) 

 Cambarus obscurus, FAXON, Proc. Amer. Acad. Arts aud Sci., XX. 148. 



Kitotcn Localities. Genesee River, Rochester, New York. 



Girard's diagnosis of C.propinquus is too imperfect to avail in the determi- 

 nation of the species, but fortunately Dr. Hagen identified it by examination 

 of one of Girard's types. 



In the Academy of Natural Sciences of Philadelphia there is a dry male 

 specimen of C. propinquus which was labelled " C. Diogenes ? District of Colum- 

 bia," when the collection was examined by Hagen. The original label of 

 this specimen is now lost, but the box contains Dr. Hagen's label, " C. pro- 

 /liin/ntix Gir. (C. Diogenes Gir. ?)," and the tablet to which the specimen is 

 fastened carries a label with the locality " District of Columbia." A dry 

 specimen of C. obesus Hag. in the same museum is labelled " C. propinyims ? 

 Garrison Creek, Sackett's Harbor." The labels of these two specimens were 

 undoubtedly transposed by accident. 



I am not sure that Bundy's C. propinqwis is this species, as I have not 

 seen his types. He says that there is ' in these crawfishes a tendency mani- 

 fested toward multiplication of the lateral thoracic spines, there being in 

 some individuals two and in others three of these on each side." This ten- 

 dency does not appear in any specimens that I have seen. It is an abundant 

 species in Wisconsin, in company with C. virllis. 



Smith says that the crayfish found in the valley of the Aroostook River 

 in Maine and New Brunswick is most likely C. propinquus. It is really 

 C. Jjiirlmiii. 



In tin! v-iiriety that I have named after the late Mr. F. G. Sanborn 



', Proc. Amer. Acad. Aris and Sci., XX. 128) the first abdominal 



appendices are less deeply bifid, the rami closer together, than in the typi- 



The rostrum is not t-arinate, the chela is finely pubescent, 



tlir inferior median anterior spine of the carpus is evident. This variety 



1 ted by Mr. Sanborn in Carter Co., Ky., and I have received addi- 



"iiiil specimens In.,,, IW. \\. V. Koons collected at Oberlin, Ohio. Small 



individuals closely lesemble young sperimeus of the typical C'. prophiqmts, 



