PROC. ENTOMOL. SOC. WASH. 83(2), 1981, pp. 300-303 DESCRIPTION OF THE ADULT OF EPHEMERELLA BERNERI ALLEN AND EDMUNDS (EPHEMEROPTERA: EPHEMERELLIDAE) WITH BIOLOGICAL NOTES Boris C. Kondratieff, John W. S. Foster, III, and J. Reese Voshell, Jr. (BCK, JRV) Department of Entomology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061; (JWSF) Maryland Fish-eries Administration, Eastern Regional Office, P.O. Box 68, Wye Mills, Maryland 21679. Abstract. — The adult of Ephemerella herneri Allen and Edmunds is de-scribed for the first time. Male genitalic characters ally this species with Ephemerella needhami McDunnough. Notes on the biology and distribution of E. berneri are also given. Ephemerella berneri was described by Allen and Edmunds (1958) from larvae collected in Georgia and Virginia. The adult has remained unde-scribed (Allen and Edmunds, 1965). We recently found large populations of E. herneri larvae in several 5th and 6th order streams in southwestern Vir-ginia. In order to describe the adult, we reared several larvae in the labo-ratory. Ephemerella berneri Allen and Edmunds Male imago (in alcohol). — Body length 12 mm, forewing 10.5 mm. Head predominantly black; clypeus white; antenna black; upper portion of com-pound eye red, lower portion orange. Thorax black; anterior lateral faces of scutum yellow; areas anterior to mesocoxa yellow; pleural membranes tan; sterna black. Foreleg black, mid-and hindlegs white; all coxae tan. Wings hyaline with longitudinal veins brown; costal area of forewing tinged with tan. Abdominal terga 1-8 chestnut brown, with pale transverse band near posterior margin of each segment; terga 9-10 black; abdominal sterna tan. Penes without spines (Fig. 1), having long apical lobes with a deep median notch; dorsal surface black; ventral surface white. Genital forceps white with 2nd segment expanded apically (Fig. 1) and edged with black. Caudal filaments white with dark brown articulations.