CAMBARUS. . 29 



6. Cambarus maniculatus. 



Aztacus maniculatus, Le Conte, Proc. A.cad. Nat. Soi. Pliila , VI] Wl, 1855 



is, 11 v.. in. 111. Cat. Mhs. Comp. Zool., No. III. p. 52, 1870. (After Le Conte.) 

 datus, Faxon, Proc. Amer. Acad. Arts and Sci., KX. L37, L884. (After Le Conte. No 

 description.) 



This species is known only from the description of Le Conte, which is 

 quoted in lull on page 52 of Hagen's Monograph. The description was 

 perhaps drawn up from an immature specimen of G. troglodytes. The num- 

 ber of hooked thoracic legs in the male is not specified in Le Conte's descrip- 

 tion, but the species is probably one of the C. Blandingn group, since it is 

 placed among the species of that group in Le Conte's list. 



7. Cambarus Lecontei. 



' Plate II. fig. 2. 



Cambarus Lecontei, Hagen, 111. Cat, Mus. Comp. Zool., No. III. p. 47. PI. I. figs. 15-18, PI. III. fig. 145. 



L870. 

 Cambarus lecontei, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 137, 1884. 



Known Localities. — Alabama : Mobile. Georgia : Athens. 



Resembles C. Blandingii and C. fallax, but is easily distinguished from 

 these by the shortness of the portion of the carapace behind the cervical 

 groove, the greater length of the acumen of the rostrum, antennal scale, and 

 chela?, and the shape of the male sexual appendages. The areola is some- 

 what wider. The rostrum is deeply excavated above, the sides converging 

 but slightly up to the lateral teeth, which are separated by more than one 

 half of the width of the base of the rostrum. The proximal segment of the 

 telson is armed on each side of its distal margin with three or four teeth. 



The proportions may be seen from the following measurements of a male, 

 form I. : Length of body, 8G mm. ; of carapace, 43 mm. ; of abdomen, 48 mm. 

 From tip of rostrum to cervical groove, 31 mm.; from cervical groove to 

 posterior border of carapace, 12 mm. Length of rostrum, 14 mm. ; of acu- 

 men, 5 mm. Breadth of rostrum at base. 7 mm. ; at lateral spines, 4 mm. 

 Breadth of areola. 1\ mm. Length of chela, 40 mm. ; breadth, 8 mm. 



Smaller specimens are more characteristic on account of a greater propor- 

 tional breadth of the areola ami shortness of posterior portion of the carapace. 

 In a male, form II., 65 mm. in length, the length of the carapace from the 

 tip of rostrum to cervical groove is 24 mm. ; from cervical groove to poste- 

 rior border of carapace, 8.5 mm. Breadth of areola. - mm. 



