92 A REVISION OF THE A.STACHXSL 



Var. cbscura. 



Cambarus obscvrus, Hagen, 111. Cat. Mus. Comp. Zodl., Xo. HI., p. 69, PI. I. figs. 72-75, PI. III. fig. 154, 



1870. 

 Cambarus obscurus, Smith, Rep. U. S. Coram. Fish ami Fisheries for 1S72 and 1S73, p. 039, 1S74. (After 



Hagen. No description.) 

 Cambarus obscurus, Faxox, l'roc. Amer. Acad. Arts and Sci , XX. 14.S. 



Khoivn Localities. — Genesee River, Rochester, New York. 



Girard's diagnosis oiC.propinqv.us 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 Q. propinquus which was labelled •■ C. Diogenesl 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- 

 pinquus 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. propinquus '.' 

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

 undoubtedly transposed by accident. 



1 am not sure that Bundy's C. propinquus 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 arid in others three of these on each side." This ten- 

 dency does not appear in any specimens that 1 have seen. It is an abundant 

 species in Wisconsin, in company with 0. viriUs. 



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 

 ( '. Bartonii. 



In the variety that I have named after the late Mr. F. G. Sanborn 

 (C. iSanbornU, Proc. Amer. Acad. Arts and Sci., XX. 128) the first abdominal 

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

 cal C. propinquus. The rostrum is not carinate, the chela is fmely pubescent, 

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

 was collected by Mr. Sanborn in Carter Co., Ky.. and I have received addi- 

 tional specimens from Prof B. F. Koons collected at Oberlin, Ohio. Small 

 individuals closely resemble young specimens of the typical <". propinquus, 



