PROCEEDINGS OF THE BIOLOGICAL SOCIETY OF WASHINGTON 112(l):70-93. 1999. Anacroneuria from northeastern South America (Insecta: Plecoptera: Perlidae) Bill P. Stark Department of Biology, Mississippi College, Clinton, Mississippi 39058, U.S.A. Abstract. — Descriptions are given for ten new species oi Anacroneuria from Venezuela, Guyana, and Suriname, and records are given for ten species pre-viously described from this region. The following 10 new species are described (type locality in parenthesis): Anacroneuria achagua (Venezuela. Portuguesa: Guanare), A. arawak (Suriname. Brokopondo: Brownsberg Naturpark, Maza-roni Plateau), A. chaima (Venezuela. Sucre: Rio Cocollar, 1.5 km SE Las Pie-dras de Cocollar), A. claudiae (Venezuela. Zulia: Rio Yasa (3 km E Kasmera), Estacion Biologica), A. karina (Venezuela. Sucre: Rio Cocollar, 1.5 km SE Las Piedras de Cocollar), A. makushi (Guyana. Kanuku Mountains, Moco Moco River), A. paria (Venezuela. Sucre: Rio Cocollar, 1.5 km SE Las Piedras de Cocollar), A. perija (Venezuela. Zulia: Parque Nacional Perija, Rio Negro, To-romo), A. timote (Venezuela. Tachira: Quebrada Los Mirtos, 8 km S El Cobre), and A. wapishana (Guyana. Potaro River, Kaieteur Falls). Anacroneuria phan-toma (Banks) and A. pictipes Klapalek are redescribed and a modified key to regional males is presented. Stark (1995) provided descriptions of Ve-nezuelan Anacroneuria based on collec-tions made primarily through 1985. Re-cently a series of Venezuelan and Guyanan specimens collected in 1994-97 were made available by O. S. Flint and R. Holzenthal, and a few specimens were provided by the California Academy of Science. This ma-terial includes nine new species, new re-cords for eight previously described spe-cies, and a few unassociated females de-scribed under informal designations. Also included are redescriptions of A. pictipes Klapalek and A. phantoma (Banks) from holotypes and an additional new species from Suriname. Holotypes are deposited in the National Museum of Natural History, Washington, D.C. (USNM) or the Califor-nia Academy of Science, San Francisco, CA (CAS). Paratypes and other specimens are deposited in the Universidad Central de Venezuela, Maracuy (UCV), the University of Minnesota, Saint Paul (UMSP) or the collection of the author (BPS). Additional material was examined from the Museum of Comparative Zoology, Harvard Univer-sity (MCZ) and the National Museum of Natural History, Prague (NMH). Anacroneuria achagua, new species Adult habitus. — Head with an obscure brown pattern over anterior half of frons; lappets brown. Median pronotal stripe pale, broad irregular lateral bands brown (Fig. 1). Wing membrane transparent, veins pale. Male. — Fore wing length 8 mm Hammer thimble shaped, height greater than basal diameter (Fig. 2). Aedeagal apex short, with wide, emarginate tip offset from shoulders; ventral aspect with an obscure pair of mem-branous lobes; dorsal keel triangular; shoul-ders somewhat quadrate, hooks stout (Figs. 3-5). Female. — ^Unknown. Nymph. — Unknown. Etymology. — The name honors the
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