CAMBARUS. I'-' 



in the genus Astacus, and in its general form agrees with the corresponding 

 limb in the other Cambari. Remarks on the relations of this interesting 

 species will be found on page 42. 



1 am disposed to regard the Cambari of this group as, on the whole, the 



lowest forms in the genus. The slight degree of specialization of the exter- 

 nal male appendages, the tendency toward an oval, astacoid form of body, 

 the slender (daws and generally toothed rostrum, all point to this. That 

 the stout-clawed species with toothless rostrum are derived from forms with 

 slender chelae and toothed rostra seems probable from the fact that the latter 

 characters are commonly found in very young individuals of all species. 

 This gn.np corresponds exactly with Group I. of Hagen's Monograph. 



, .. , . r Epistoma rounded in front: C. Blandingii, C. 

 Section of the carapace behind cervi- ) //,„ / / c /„// ,,■-.- 

 cal groove loug(see p. Is) ^ Epistoma truncate: C Clarkii, C. troglodytes. 



Ro^t linn toothed I „ ■ ,■ 1 i f Areola narrow: C. Lecontei 



s Posterior section of carapace short \ Areolawide . C. spiculi/er, C. versulus, C. angus- 



( see P ' ' (. talus, C. pudes, 



opbied : C. pellucidus. 

 Rostrum toothless. 0. Wiegmanni, G penicillatus, C. Atteni. 



1. Cambarus Blandingii. 



Plate VII. lifts. 2, 2 . 2 ', 3 a, 2 a (first abdominal appendages of male). 



Astacus Blandingii, Haklan, Trans. Amer. Philosoph. Soc, III. 464, 1330. — Medical and Physical Re- 



searches, p. 229, Gg. 1, 1835. 

 Astacus Blandingii, Milne Edwabds, Histoire Naturelle des Crustaces, IT. 332, 1837. (After Harlan.) 



Blandingii, De Kay, Zoology of New York, Part VI. Crustacea, p. 23, 1844. (After Harlan.) 

 Astacus {Cambarus) Blandingii, Erichson, Arch. f. Naturgesch., Jahrg. XII., I. OS, 1846. (After Harlan.) 

 F dstacus Blandingii, Le Cokte, Proo. Acad. Nat. Sei. Pliila , VII. 400, 1855. 

 Cambarus Blandingii, Eagen, 111. Cat. Mus. Comp. Zool., No. III., 43, PI. I. figs. 63, 64, PL III. fig. 140, 



1870. 

 Cambarus acutus, var. B, Hagen, op. cit., p. 36, PI. Ill Gg. L44, l^U 

 Cambarus acutus, Abbott, rimer. Naturalist, VII. 80, 1873 (Habits.) 

 Cambarus acutus (in part), Smith, Rep. U. S. Comm. Fish and Fisheries for 1872 and 1873, p. 637, 1874. 



(After Eagen and Abbot.l No description.) 

 Cambarus Blandingii, Faxon, P Amer. Acad Art- and Sri, X\ L35, l vs t 



Knoivn Localities^— New York. New Jersey: Essex Co.; Delaware River 

 and tributaries, near Trenton. Maryland : Baltimore Co. (Coll. P. R. Uhler) ; 



* l„ ens of C fallax the hinder secti f the carapace is a little less than one half the 



roi cervical groov, to the tip of the rostrum C. m dculutus (LeC.) is omitted from the 



above table, as 1 have seen no specimens answering to the description of Le I onte. 



■j- |,„ rhich no authority is given in parentheses are represented in the collection ol the 



Museum of Comparative Zoology. 



