86 



A I IE VISION OF THE ASTAC1D.E. 



Rostrum without lateral teeth (at least in the adult). 



f Areola linear in the middle. C. Mississippiensis. 



Rostrum 



with lat- 

 eral teeth. 



Areola linear in the middle 



Areola of 



moderate 

 width. 



I Areola not linear in any part. C. medius, C. immunis.* 



(" Rostrum and antcunal scales very long. C. lancifer. 



I Rostrum and antennal scales of moderate length. C. Palmeri. 



Rostrum with a median carina above. C. Atabamensis, C. compressus, C. propiuquus. 



{ Sides of carapace armed with numerous spines. ('. affinis. 



Rostrum but slightly excavated, or sub-plane. 

 (' sirilis, C. propiuquus, var. obscura, I ' S 



C Margins of rostrum concave. 



Rostrum I 

 not ca- ■{ Only one lateral 



riiiated. 



spine on cara- 

 pace (sometimes 

 obsolete). 



Rostrum deeplj 



excavated, with 

 raised margins. 



C. Sarrisonii, C. rusticus, 



C. forceps. 



Margins of rostrum straight 

 C.propinquus, var. Sanbornii, 

 ('. spinosus, C. Putnami. 



35. Cambarus lancifer. 



Cambarus lancifer, Hagen, 111. Cat. Mus. Comp. Zocil., No. III. p. 5 l J, PI. I. figs. SG, 87, PI. III. fig. 159, 



1870. 

 Cambarus lancifer, Faxon, Proc. Anicr. Acad. Arts and Sci., XX. 14G, 1SS4. 



The only specimen of this species known is Hagen's type from Root 

 Pond, Miss. I cannot find in what part of the State Root Pond is situated. 



36. Cambarus affinis. 



r Astacus limosus, Rajinesque, Amer. Monthly Mag. and Critical Rev., II. 42, Nov. 1817. 



affinis, Say, Journ, Aead. Nat. Sci. Phila., 1. 168, Dee. 1S17. 



tffinis, IIakiax, Medical and Physical Researches, p. 230, fig. 2, 1835. 



Bartonii, Milne Edwabds, Eistoire Naturelle des Crustaces, 11. 331, 1837. 



affinis, De Kay, Zoology of New York, Part VI. Crustacea, ]>. 23, 1MI. (After Saj ) 

 '■ Astacus {Cambarus) affinis, Ebichson, Arch. f. Naturgescli., Jahrg, Ml . 1. 96, 1846. 



us affinis, Gikaud, Proc. Acad. Nat. Sci. Phila., VI. 87, 1852. (Young.) 

 Cambarus Pealei, Giu.uin, Proc. Acad. Nat. Sci. Phila., VI. 87, 1852. (Adult.) 



i affinis, Hagen, 111. Cat. Mus. Comp. Zool., No. 111. p. CO, PI. 1. figs. 19-22, 84, ^5, PI. III. fig. 



L52, PL V., 1S70. 

 Cambarus affinis, Abbott, Amer. Naturalist, VII. 80, 1873. (Habits.) 

 Cambarus affinis, Smith, Rep. U. S. Comiii. Fish and Fisheries for ls72 and lb?:i, p. 638, L874. (After 



Hagen and Abbott ) 

 Cambarus affinis, Faxon, Proc Amer Acad. Arts and Sci., XX. IKi, IS84. 



Known Localities. — New York : Niagara. New Jersey : Schooley's Moun- 

 tain, Morris Co.; Red Bank, Monmouth Co. (Coll. Acad. Nat. Sci. Phila.); 

 Trenton; Burlington: Camden Co. (Coll. Acad. Nat. Sci. Phila.). Pennsyl- 



* There is a variety of C. immunis with lateral rostral spinet See p 99 



