QH 7^ 1 B4X HH 348 3 October 1969 PROCEEDINGS /^"^^^fev OF THE / ^^ BIOLOGICAL SOCIETY OF WASHINGTQNT^' 2 TWO NEW SPECIES OF THE CRAYFISH GENUS PROCAMBARUS ( DECAPODA, ASTACIDAE ) WITH KEYS TO THE MEMBERS OF THE SPICULIFER GROUP By Horton H. Hobbs, Jr. Smithsonian Institution, Washington, D.C. The two species described here have Hmited ranges in Louisi-ana and Georgia. That from Louisiana has been found in a few localities in the Ouachita drainage system in Claiborne, Ouach-ita, and Union parishes, and that from Georgia in the Flint River System in Crawford, Lee, Schley, and Sumter counties. Keys to the species of the Spiculifer Group, one based on first form males and the other on females, are provided and include summaries of the ranges of each. Procambarus elegans new species (Figures 1-11, 24, 25) Diagnosis: Body pigmented, eyes well-developed. Rostrum with gently convergent margins bearing pair of marginal spines; acumen long and slender. Areola 5.19 to 5.9 times longer than wide and constituting 26.6 to 28.6 percent o£ entire length of carapace. Carapace with two cervical spines on each side. Suborbital angle small and rounded. Postorbital ridges terminating in spines. Antennal scale approximately 2.5 times longer than wide, broadest proximal to midlength. Mesial margin of palm of chela with seven or eight tubercles, and both fingers provided with moderately well defined longitudinal ridges. Ischiopodites of third and fourth pairs of pereiopods with hooks, that of fourth weakly bituber-culate; coxae of fourth and fifth pereiopods with prominences. First pleopods asymmetrical, without shoulder on cephalic surface, reaching cephalad to coxae of third pair of pereiopods, and provided with subter-minal setae; distal extremity bearing (1) slender acute mesial process directed mesiodistally and slightly caudally, (2) short spinelike cephalic process arising from cephalic surface of appendage and extending cephalo-distally, (3) caudal element consisting of truncate caudal knob bearing minute, acute, toothlike caudal process directed cephalodistally, and (4) short, corneous central projection, situated immediately caudal to cephalic 24— Proc. Biol. Soc. Wash., Vol. 82, 1969 (329)
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