92 A REVISION OF THE ASTACIDA. 
Var. obscura. 
Cambarus obscurus, Hagen, Ill. Cat. Mus. Comp. Zool., No. III., p. 69, Pl. I. figs. 72-75, Pl. III. fig. 154, 
1870. 
Cambarus obscurus, Suivi, Rep. U. S. Comm. Fish and Fisheries for 1872 and 1873, p. 639, 1874. (Alter 
Hagen. No description.) 
Cambarus obscurus, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 148. 
Known 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. propinguus 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- 
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. 
I 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 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. virilis. 
Smith says that the crayfish found in the valley of the Aroostook River 
in Maine and New Brunswick is most likely C. propinguus. It is really 
C. Bartonii. 
In the variety that I have named after the late Mr. F. G. Sanborn 
(C. Sanborni, Proc. Amer. Acad. Arts and Sei., XX. 128) the first abdominal 
appendages are less deeply bifid, the rami closer together, than in the typi- 
eal C. propinguis. The rostrum is not carinate, the chela is finely 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 C. propinquus, 
