FRESH-WATER CRUSTACEA OF THE UNITED STATES. 639 



Cambarus obscurus Hageu. 



Op. cit., p. 69, pi. 1, figs. 72-75; pi. 3, fig. 154. 



Genesee Eiver, New York. 

 Cambarus rusticus Girard. 



Loc. cit., p. 83; Hageu, op. cit., p. 71, pi. 1, figs. 80-S3 ; pi. 3, fig. IGl. 

 Ohio ; Lake Superior. 



Cambarus immunis Hagen. 



Op. cit., p. 71, pi. 1, figs. 101, 102 ; pi. 3, fig. 160 ; pi. 8. 

 North Carolina; Ahxbama; Illinois. 

 Cambarus Bartonii Erichson. 



Asiacus Bartonii Fiibricius, Supplemeutum Eiitomologice Systomaticne, p. 407, 



1798 ; Say, loc. cit., p. 167. 

 Carnbarus Bartonii Erichson, loc. cit., p. 97; Hagen, op. cit., p. 75, pi. 1, figs. 47-50; 



pi. 2, figs. 135-139 ; pi. 3, fig. 166. 

 Cambarus montanits, Diogenes, 2>usiUt(s, and longnlus (?) Girard, loc. cit., pp. 88, 90. 



This seems to be the commonest species in the Northern States. It is 

 found in Vermont and Massachusetts, in the tributaries of Lake Cham- 

 jjlain and Hudson Eiver, and extends west to Lake Superior and south 

 to New Jersey, Maryland, and Kentucky. 



Professor Yerrill has collected it under stones in cold brooks in North- 

 ern New York, and in McKean County, Pennsylvania; but, according to 

 Dr. Abbott, it is, in the vicinity of Trenton, N. J., a burrowing species. 

 He says, "The burrows, so far as we have observed them, have all been 

 in the banks of the smaller streams and meadow-ditches, (and occasion- 

 ally a colony of burrows in the river-bank, where peculiarly favorable,) 

 a little below the usual water-line." It occurs in Mammoth Cave with 

 C. lidlucidits. 



Cambarus robustus Girard. 



Loc. cit., p. 90; Hagen, op. cit., p. 80, pi. 3, fig. 156. 



Western New York. 

 Cambarus obesus Hagen. 



Op. cit., p. 81, pi. 1, figs. 39-42; pi. 3, fig. 163; pi. 9. 



Virginia; Illinois; Lake Michigan; Arkansas; New Orleans. 

 Cambarus pellucidus Erichson. 



Astacns pellucidus Tellkamj)f, Miiller's Arcbiv, 1844, p. 383, {teste authors.) 

 Cambarus pellucidus Erichson, loc. cit., p. 95; Hagen, op. cit., p. 5.5, pi. 1, figp. 



68-71 ; pi. 3, fig, 148 ; pi. 6 ; Packard, American Naturalist, vol. v, p. 50, fig. 



131, 1871 ; Hageu, American Naturalist, vol. vi, p. 494, 1872; Packard, Fifth 



Annual Report Peahody Academy of Science, Salem, p. 94, 1873. 

 Orconectes pellucidus and inermis Cope, American Naturalist, vol. vi, p. 419, fig. 116, 



1872; Third and Fourth Annual Reports of the Geological Survey of Indiana, p. 



173, 1872. 



This is the blind species of Mammoth Cave, Kentucky, and Wyan- 

 dotte Cave, Indiana. It is a fact worthy of notice that C. Bartonii 

 occurs in Mammoth Cave with well-developed eyes. 



