Vol. 61, pp. 85-92 June 16, 1948 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A NEW CRAYFISH OF THE GENUS ORCONECTES FROM SOUTHERN TENNESSEE (Decapoda, Astacidae) HOETON H. HOBES, Jr.1 The new crayfish herein described belongs to the Limosiis Section of the genus Orcouecfes, and the locality from which it was collected is the most southern record for the epigean members belonging to this section. The previous most southern record for the pigmented species belonging to this assemblage is that of Orconectes shoupi Hobbs (1948: 14) which was collected in a tributary of the Cumberland River near Nash-ville, Davidson County, Tennessee. Among the members of the Limosus Section only the cavernieolous Orconectes pellucidus australis (Rhoades 1941:142) has been collected farther south — in several caves in northern Alabama — and no species be-longing to this section has been taken farther southwest. Hobbs (1948:20) has constructed a key for the identification of the 13 previously known species and subspecies of this section, and the gonopods of twelve of them are figured in the same paper. A revised key to the nine epigean species is included below. Genus Orconectes Cope 1872 Orconectes wrigliti, sp. nov.2 Diagnosis. — Rostrum with small, corneous, lateral spines or tubercles; margins not distinctly thickened and converging; upper surface without median carina, concave and heavily pubescent. Fingers of chela with well defined longitudinal ridges. Epistome with a slight longitudinal median ridge. Areola about six times longer than broad, with four or five punctations in narrowest part — length about 32% of entire length of carapace. Male with hooks on ischiopodites of third pereiopods only. Terminal elements of first pleopod of first form male short, reaching almost to coxopodite of second pereiopod. Two terminal elements sepa-rated for only a short distance near tip, slightly divergent, and subequal in length. Annulus ventralis immovable (see fig. 1 for surface contour), Holotypic Male, Form I. — Body subovate, not conspicuously depressed. Abdomen narrower than thorax. Width of carapace greater than depth in region of caudodorsal margin of cervical groove (12.2-10.9 mm.). iMillei-School of Biology, University of Virginia. -This species is named in honor of my good friend, Dr. Mike Wright of Tuscu-lum College. Dr. V\'right collected the specimens on which the following descrip-tions are based, and he has added numerous other invaluable-specimens to mv collection. --. . • -Proc. Biol. Soc. Wash., Vol. 61 /■^•^•^•-''fss) . -.-.