PROC. ENTOMOL. SOC. WASH. 107(2). 2005. pp. 273-278 TWO NEW FERN-FEEDING SAWFLIES OF THE GENUS ANEUGMENUS HARTIG (HYMENOPTERA: TENTHREDINIDAE) FROM SOUTH AMERICA David R. Smith Systematic Entomology Laboratory, PSI, Agricultural Research Service, U.S. Depart-ment of Agriculture, % National Museum of Natural History, Smithsonian Institution, RO. Box 37012, MRC 168, Washington, DC 20013-7012, U.S.A. (e-mail: dsmith@sel. barc.usda.gov) Abstract. — Aneugmenus merida, n. sp., from Venezuela and Ecuador and A. Colombia, n. sp., from Colombia are described. Aneugmenus merida was reared from larvae feeding on bracken fern, Pteridium aquilinum (L.) Kuhn. in Venezuela. These are the only two species of this Holarctic genus known from South America. The species are illustrated and separated from other New World species of Aneugmenus. Aneugmenus leucopoda (Cameron 1883) is a new combination. Key Words: Selandriinae, ferns, Venezuela, Colombia Species of Aneugmenus Hartig are rather stout sawflies, around 6 mm in length, and are mostly black with contrasting yellow legs. They are distinguished from other New World selandriine genera by the ab-sence of the anal crossvein in the forewing, the presence of an epicnemium as a flat sclerite separated from the mesepisternum by a suture, a genal carina at least partially developed on the sides of the head, a cir-cular carina on the frons, a flat clypeus with the anterior margin tuncate, a sessile anal cell of the hind wing, and bifid tarsal claws with a distinct basal lobe. Smith (1969) revised the Nearctic species of Aneugmenus and included three species. It was later determined that A. floridella Ross 1930 was distinct; thus, four species are listed in the North American catalog (Smith 1979). Other than A. scutellatus Smith 1969 from southern Arizona and northern Mexico, only two species have been described from the Neotropics, A. nigritarsis Rohwer 1911 from Mexico and A. leucopoda (Cameron 1883) from Guatemala. There are, however, a num-ber of undescribed species from Mexico and Central America. One of the species treated here was reared from Pteridium aquilinum (L.) Kuhn. in Venezuela by Daniel Otero and Maria Pia Calcagno, Universidad de Los Andes, Merida, Venezuela, who are work-ing on its life cycle, feeding habits, and ecology. The reared adults proved to be a new species of Aneugmenus Hartig. Identity of this species prompted this review of the South American species of Aneugmenus, and, because I am aware of only one other species in South America, a new species from Colombia also is described. Colombia, Ecuador, and Venezuela are the southern-most records for Aneugmenus in the West-ern Hemisphere. Aneugmenus merida Smith, new species (Figs. 1-7) Female. — Length, 6.0 mm. Antenna and head black. Thorax black with tegula and posterior margin of pronotum yellow. Legs yellow with coxae and trochanters hkick
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