QH 1 B4X 0, pp. 163-168 28 July 1967 NH PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A NEW CRAWFISH OF THE CRISTATUS SECTION OF THE GENUS CAMBARUS FROM MISSISSIPPI (DECAPODA, ASTACIDAE)! By J. F. FiTZPATRiCK, Jr. Mississippi State University, State College, Mississippi 39762 The species described below is assigned to the Cristatus Section (Hobbs, 1955: 98) of the crawfish genus Camharus. It is compatible with the diagnosis of the Section as given by Hobbs (1966: 109), except that the areola is longer (upper limits: Hobbs, 1966, 35.5% length of carapace; valleculus, 38.7%). The other two species in the Section are in the Tombigbee River watershed; the new species is in the upper Pearl River watershed. Cambarus valleculus new species Diagnosis: Rostrum subplane or slightly excavate, subspatulate, without marginal spines or tubercles. Areola 4.75-3.31 (avg. 4.20) times longer than broad, constituting 32.2-28.7 (avg. 34.2) per cent of entire carapace length. Suborbital angle much reduced. Antennal scale more than one-half as broad as long. Chela with cristiform row of tubercles along mesial margin of palm. First pleopod of male with central projection directed at approximately 105-degree angle to main shaft of appendage; mesial process slender, directed at 120-degree angle (approximately), extending caudad almost half its length beyond tip of central projection. Pleopods slightly asymmetrical (Fig. 12). Annulus ventraUs subovoid with deep cephalic sinus that disappears in caudal half. (Fig. 8). Holotypic male. Form I: Body subovate, compressed laterally. Abdo-men narrower than cephalothorax (8.0; 9.8 mm, respectively). Width of carapace less than depth in region of caudodorsal margin of cervical groove (9.8; 10.0 mm). Areola moderately broad (4.1 times longer than wide) with irregular row of punctations mesial to each branchioe^^, cardiac groove and irregular median longitudinal row, bi^ three puncAf//f /i^ •1^^ ^ This study is supported in part by National Science Foundation grant nOif"''! GB-4719. "-25— Proc. Biol. Soc. Wash., Vol. 80, 1967 (163
BioStor
