54 A REVISION OF THE ASTACID^. 



19. Cambarus advena. 



dstacus adeem., Le Conte, Proc. Acad. Nat. Sci. Phila., VII. 402, 1855. 



Cambarm Carolinus, Hagen, IU. Cat. Mus. Comp. Zool., No. III. p. 87, PL I. figs. 51-54, PI. III. fig. 1G5, 



1870, 

 Cambarus ador.mi, Hagen, 111. Cat. Mus. Comp. Zool., No. III., PI. III. fig. 164, PI. VII.. 1870. 

 Cambarus adoeiia, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 140, 1884. 



There is a female type specimen of Le Conte's Astacits advena in the 

 Museum of Comparative Zoology, and another, also a female, in the col- 

 lection of the Academy of Natural Sciences of Pliiladelphia. By some error 

 Dr. Hagen transposed the descriptions of C. advena and C. Carolinus in his 

 Monograph, so that his descriptions do not agree with his own types of these 

 species in the Museum of Comparative Zoology ! He gives, under the name 

 of C. advena, a full figure of Le Conte's species on Plate VH., and the anten- 

 nal scale, spine of the second segment of the antenna, and epistoma (from 

 Le Conte's type in the Philadelphia Academy) on Plate IH. fig. 164. The 

 male appendages, antennal scale, and epistoma are figured on Plate L figs. 

 51-54, Plate III. fig. 165, as C. Carolinus. 



" Habitat in Georgia inferiore. Hyeme vitam degit subterraneam. Estate 

 in fossis invenitur." (Le Conte.) 



• The type of Le Conte in the Museum of Comparative Zoology has a spine 

 on the lower side of the first segment of the antennules, as in C. Carolinus. 



20. Cambarus Carolinus. 



? Astacus {Cambarus) Carolinus, Erichson, Arch. Naturgesch., XII. Jalirg., I. 96, 1846. 

 Cambarus advena, Hagen, 111. Cat. Mus. Comp. Zool, No. III. p. 86, I'l. ]. figs. 90-92, 1870. 

 Cambarus Carolinus, Hagen (as dctcrniiued by examiuatiou of his type spcciuieu !). 

 Cambarus Carolinus, Faxon, Proc. Auier. Acad. Arts and Sci., XX. 140, 1884. 



For the transposition of the descriptions and part of the figures of C. Caro- 

 linus and C. advena in Hagen's Monograph, see above. Hagen's types of 

 these two species in the Museum of Comparative Zoology are correctly de- 

 termined. The larger dimensions given by Hagen (p. 86), 2.9 in., are those 

 given by Le Conte for Astacus advena. 



Hagen's type, labelled " Cambarus Carolinus Er.," and described by him 

 (p. 86) as Cambarus advena LeC, is a male of the first form (M. C. Z., No. 

 232) from Charleston, S. C. It differs from Astacus advena LeC. as follows. 

 The rostrum is less triangular and less deflexed, the cephalothorax more 



