Vol. 84, No. 12, pp. 95-102 30 June 1971 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A NEW CRAWFISH OF THE SPICULIFER GROUP OF THE GENUS PROCAMBARUS (DECAPODA, ASTACIDAE) FROM CENTRAL MISSISSIPPI By J. F. FiTZPATRiCK, Jr. and Horton H. Hobbs, Jr. Randolph-Macon Woman's College, Lynchburg, Virginia 24504 and Department of Invertebrate Zoology, Smithsonian Institution, Washington, D.C. 20560 The members of the SpicuHfer Group of the crawfish genus Procambarus inhabit lotic habitats in the Coastal Plain and Piedmont provinces of the southeastern United States. Al-though only five of the 15 described species have allopatric ranges, only four species have been previously reported as occurring in the same locality with another member of the Group: P. elegans Hobbs, 1969: 329, and F. vioscai Penn, 1946: 27, in Louisiana, and P. spiculifer (LeConte, 1856: 401) and P. versutus (Hagen, 1870: 51) in Alabama and Florida (Hobbs, 1969: 347). To such associations we can now add that of P. spiculifer and P. raneyi Hobbs, 1953: 412, in Big Flat Creek, a tributary to the Alcovy River, Walton County, Georgia. The range of the species described here, while seemingly allopatric, is almost completely surrounded by that of a yet undescribed member of the group which fills the apparent hiatus in the range between P. ablusus Penn, 1963: 121, and other species of the group: P. versutus and P. lagniappe Black, 1968: 5, to the east; P. penni Hobbs, 1951 : 273, to the south; and P. vioscai to the west. Procambarus lylei new species (Figures 1-14) Diagnosis: Body pigmented, eyes well-developed. Rostrum with con-vergent margins bearing pair of marginal spines; acumen long and slender. Areola 2.5 to 5.3 times longer than wide and constituting 25.0 to 30.2 percent of entire length of carapace. Carapace with two cervical spines 12— Proc. Biol. Soc. Wash., Vol. 84, 1971 (95) JUN3 019/
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