54 A REVISION OF THE ASTACID. 
19, Cambarus advena. 
Astacus advena, Le Contn, Proc. Acad. Nat. Sci. Phila., VII. 402, 1855. 
Cambarus Carolinus, HaceEn, Ill. Cat. Mus. Comp. Zodl., No. III. p. 87, Pl. I. figs. 51-54, Pl. III. fig. 165, 
eee Hacen, Ill. Cat. Mus. Comp. Zool., No. IIL. Pl. TIL fig. 164, Pl. VII., 1870. 
umbarus advena, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 140, 1854. 
There is a female type specimen of Le Conte’s Astacus advena in the 
Museum of Comparative Zoblogy, and another, also a female, in the col- 
lection of the Academy of Natural Sciences of Philadelphia. By some error 
Dr. Hagen transposed the descriptions of C. advena and C. Carolus in his 
Monograph, so that his descriptions do not agree with his own types of these 
species in the Museum of Comparative Zodlogy! He gives, under the name 
of C. advena, a full figure of Le Conte’s species on Plate VIL, 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 III. fig. 164. The 
male appendages, antennal scale, and epistoma are figured on Plate I. figs. 
51-54, Plate HL. fig. 165, as C. Carohinus. 
“ Habitat in Georgia inferiore. Hyeme vitam degit subterraneam. Aistate 
in fossis invenitur.” (Le Conte.) 
The type of Le Conte in the Museum of Comparative Zodlogy has a spime 
on the lower side of the first segment of the antennules, as in C. Carolinus. 
20. Cambarus Carolinus. 
? Astacus (Cambarus) Carolinus, Ericuson, Arch. Naturgesch., XII. Jahrg., I. 96, 1846. 
Cambarus advena, Hacen, Il. Cat. Mus. Comp. Zodl., No. IIL. p. 86, Pl. I. figs. 90-92, 1870. 
Cambarus Carolinus, Hacnn (as determined by examination of his type specimen !). 
Cambarus Carolinus, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 140, 1884. 
For the transposition of the descriptions and part of the figures of C. Caro- 
linus and C. advent in Hagen’s Monograph, see above. Hagen’s types of 
these two species in the Museum of Comparative Zoilogy 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 Asfacus advena LeC. as follows. 
ee j 
The rostrum is less triangular and less deflexed, the cephalothorax more 
