CAMBARUS. 
oo 
— 
“Long. 1.95. Cephalothorax .6. Thorax .25. Abdomen .8. Cauda .3. 
Antenna .9. Chela .6, latitud. .2, forceps .3. 
“ Habitat in Georgia inferiore, in aque pure rivulos qui inter colliculos 
arenosos (sand-hills) currunt.” 
The Philadelphia type agrees well with Le Conte’s description. The 
chela, however, under close inspection, is seen to be covered with obsoles- 
cent, ciliate, squamous tubercles, and the areola is moderate rather than 
wide. The fingers are ciliated along their inner margins. There is a single 
lateral spine on each side of the thorax, three spines on the right side of the 
telson, four on the left side. Carpus with two prominent spines on the inside, 
and one below, near the exterior articulation of the hand. ‘The sides of the 
rostrum converge but little from the base to the lateral spmes. The acumen 
is long. The sexual appendages are figured by Hagen. The measurements 
of this specimen (a male, form I.) are these : — 
Length, 47 mm. Carapax, 22 mm. Abdomen, 25 mm. From tip of ros- 
trum to cervical groove, 16 mm. From cervical groove to posterior border 
of carapace, 6 mm. Length of rostrum, 8 mm.; acumen, 3mm. Width of 
rostrum at base, 3 mm.; between lateral spines, 2mm. Width of areola, 
15mm. Length of chela, 15 mm.; breadth of do., 4 mm. 
It resembles C@. Leconte’ in general appearance, the shape of hand, and 
number of lateral thoracic and telson spines. The first pair of abdominal 
legs are different, resembling those of O. spiculifer, but different from either. 
The sides of the rostrum are more nearly parallel than in C. Lecontei, im 
this respect resembling (. versutus. It seems to be a very much smaller 
species than its near allies. 
9, Cambarus pubescens. 
Plate I. fig. 3, Plate VIII. figs. la, la. 
Cambarus pubescens, Faxon, Proc. Amer. Acad. Arts and Sci., XX. 109, 1884. 
Male, form II. — Rostrum long, triangular, sides subparallel at the base, 
then converging towards the lateral spines, which are evident ; slightly de- 
pressed above at the base, subplane, with raised margins ; ciliated, especially 
on the acumen; acumen long, pointed. Post-orbital ridges with anterior 
spines. Carapace cylindrical, fore border angulated behind the antenne, 
punctate above, slightly granulated on the sides, with one lateral _spine_on_ 
each side. Cervical groove ciliated. Cardiac region short (much less than 
SoC eIe: 
