CAMBARUS. 33 
10. Cambarus spiculifer. 
Plate Il. fig. 5. 
Astacus spiculifer, Lu Conte, Proc. Acad. Nat. Sci. Phila., VII. 401, 1855. 
Cambarus spiculifer, Hacen, Ul. Cat. Mus. Comp. Zodl., No. 11. p. 48, Pl. I. figs. 59-62, Pl. IIL. fig. 147, 
1870. 
Cambarus spiculifer, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 138, 1884. 
Known Localities.— Upper Georgia: Oconee River at Athens and Milledge- 
ville ; Ocmulgee River in the neighborhood of Atlanta (Coll. Butler Univ., 
from D. 8. Jordan); Chattahoochee River at Roswell, Cobb Co., and near 
Gainesville ; Etowah River (Coll. Butler Univ., from D. 8. Jordan). 
There is a male type, form I., in the Museum of Comparative Zodlogy, 
and one in the Academy of Natural Sciences of Philadelphia. 
In none of the specimens seen by me are there three spines on each 
side of the basal segment of the telson, as is said by Hagen to be some- 
times the case (p. 49), nor have I seen an individual with but one lateral 
thoracic spine (Hagen, p. 50). I think these statements are based upon 
erroneous determinations, for in the jarful of specimens from Athens, Ga., 
labelled Cambarus syeulifer by Hagen, I find the young of C. Leconte’, which 
has a trispinous telson and one lateral thoracic spine. 
Measurements of a male, form I].— Length, 71.5 mm. Carapace, 34.5 mm. 
Abdomen, 37.5mm. From tip of rostrum to cervical groove, 25.5.mm.; from 
cervical groove to posterior margin of carapace, 9mm. Length of rostrum, 
11.25 mm. ; breadth of rostrum at base, 5.56 mm.; between lateral spines, 
2.75mm. Length of chela, 29 mm.; breadth of do., 11mm. Width of areola, 
3.5mm. The largest specimen seen by me is 97 mm. long, male form II. 
Cambarus spiculfer has been found as yet only in Upper Georgia, in the 
Altamaha and Chattahoochee River basins. 
C. Leconte, C. angustatus, C. pubescens, C. spiculifer, and C. versutus are dis- 
tinguished from the other species of Group I. by the shortness of the 
cardiac region of the carapace. C. Leconte’, C. angustatus, and C. pubescens 
have one lateral thoracic spine on each side; C. spiculifer and C. versutus 
have two. C. Leconted and C. angustatus have subcylindrical hands, areola 
of moderate width, rostrum smooth and hollowed out above ; C. pubescens 
has broader hands and areola, rostrum pubescent and subplane above. In 
C. angustatus the sides of the rostrum are subparallel; in C. Leconte: the 
rostrum is more tapering. In both C. smeulifer and C. versulus the areola is 
e v 
