Vol. 51, pp. 137-142 August 23, 1938 PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON A NEW SPECIES OF FRESH-WATER AMPHIPOD OF THE GENUS SYNPLEONIA, WITH REMARKS ON RELATED GENERA. 1 BY CLARENCE R. SHOEMAKER. In May, 1932, Mr. Andrew Pizzini brought to the United States National Museum a collection of amphipods which he had taken from a spring a short distance west of Georgetown, D. C. One of the specimens, a mature male, possessed a com-bination of characters not agreeing with those of any of the established genera of fresh-water amphipoda, and was, there-fore, recognized as a new genus and species. In 1934 Dr. Edwin P. Creaser established the genus Synpleonia for speci-mens which he had received from Franklin County, Kansas, and, as the present species agrees in all essential characters with his genus, I now designate it as Synpleonia pizzinii. Since the discovery of this species in 1932, fine specimens have been taken at a number of localities in the District of Columbia and near-by Maryland and Virginia. Mr. John W. Price, of Lan-caster, Pennsylvania, has from time to time taken very large mature specimens of this species in Refton Cave and in the out-crop of subterranean waters in Lancaster County, Pennsylvania. Mr. K. Dearolf has also taken it in Pennsylvania at Refton Cave, Lancaster County; Johnson (upper) Cave, Center County; and Barton Cave and Dulany Cave, Fayette County. Synpleonia pizzinii, new species. Diagnosis. — First antenna not greatly longer than second. First gnatho-pod very much stronger and stouter than second. The fifth peraeopod of the male with second joint very long and narrow, and produced distally into a very prominent anterior downward-projecting lobe which is separ-ated from the posterior lobe by a deep narrow oblique sinus. i Published by permission of the Secretary of the Smithsonian Institution. 32— Pkoc. Biol. Soc. Wash., Vol. 51, 1938. (137)
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