J. HYM. RES. 1(1), 1992 pp. 91-102 A Revision of Perissocentrus Crawford (Hymenoptera:Torymidae) E. E. Grissell Systematic Entomology Laboratory, PSI, Agricultural Research Service, USDA, c/o National Museum of Natural History NHB 168, Washington, D.C. 20560, U.S.A. Abstract. — The South American genus Perissocentrus is revised. Six valid species are recognized: P. argentinae Crawford, P. caridei Brethes, P. chilensis Crawford, P. phormio (Walker) (with Monodontomerus vianai Blanchard and Megastigmus porteri Brethes as new synonyms), P. striatulus n. sp., and P. tumidulus n. sp. A neotype is designated for P. caridei. Perissocentrus bruchi Girault is transferred to the genus Zaglyptonotus Crawford. All species of Perissocentrus have been reared as parasites of lepidopterous pupae, but two species also are facultative hyperparasites of Ichneumonidae which attack the pupae. The genus Perissocentrus Crawford is known from the Neotropical region between 10° north of the equator and 40° south. Five species were previously recognized. This is the first revision of the genus and it is based upon my study of type material and nearly 600 reared and collected specimens. I recognize 6 species as valid: argentinae Crawford, caridei Brethes, chilensis Crawford, phormio (Walker) (with new synonyms Megastigmus porteri Brethes and Monodontomerus vianai Blanchard), striatulus n. sp., and tumidulus n. sp. Perissocentrus bruchi Girault is transferred to the genus Zaglyptonotus Crawford. All species were reared as parasitoids of lepidopterous pupae, but 2 species were reported also as hyperparasites of ichneumonids attacking the pupae. It is possible that most, if not all, species act as facultative hyperparasites. Included in this paper is a host-parasite list (authors' names for hosts appear only in this list). ACKNOWLEDGMENTS I thank F. C. Thompson and G. A. P. Gibson for their very thorough reviews of this manuscript and for helping elucidate several nomenclatural problems that had arisen in earlier drafts. I also thank S. Heydon and P. M. Marsh for reviewing this manuscript and for contributing improvements to its consistency. I especially thank Natalia Florenskaya for the habitus drawing (Fig. 26). Material was borrowed, or examined, with the help of the following curators and institutions and 1 thank them for their help (acronyms given are used in the text): J. S. Noyes and Z. Boucek, The Natural History Museum, London, England (BMNH);G. A. P. Gibson, Canadian National Collection (CNC); L. De Santis and R. Ronderos, Facultad de Ciencias Naturales y Museo, La Plata, Argentina (FCNM); J. M. Gallardo, Museo Argentina de Ciencias Naturales 'Bernardino Rivadavia,' Buenos Aires, Argentina (MBR). USNM is used for material housed in the United States National Musuem of Natural History. For help in checking host names of Lepidoptera and Ichneumonidae I thankR. W. Carlson, D. R. Davis, D. C. Ferguson, R. W. Hodges, R. W. Poole, R. K. Robbins, and M. A. Solis from the combined staffs of the Systematic Entomology Laboratory, U. S. Department of Agriculture and the Department of Entomology, Smithsonian Institution. PERISSOCENTRUS Crawford 1910 Fig. 26, habitus Perissocentrus Crawford 1910:235. Type species: Perissocentrus chilensis Crawford. Original Designation. Diagnosis. — Occipital carina (Fig. 18) present, ventrally joining hypostomal carina, placed mid-way between vertex and foramen; head in dorsal view transverse (Fig. 1-6, upper); antenna with first flagellomere (i.e. ring segment) reduced, much wider than long; antennal club 3-segmented; clypeal apex straight; marginal vein 4 to 5X longer than stigmal, postmarginal 2X longer than stigmal; frenal groove present; notauli complete; hindfemur with single, subapical tooth (Figs. 11-14) and sometimes with secondary distal lobe (Figs. 11-13); hindtibia (Figs. 11-14) straight, apex truncate, 2 hindtibal spurs inserted 1 /5th or more distance from apex (Fig. 15), greatly elongate, the shorter one not ex-tending much beyond hindtibial apex; propodeum projecting beyond metapleuron (Fig. 23), with well developed median carina (Figs. 7-8), sublateral foveae absent; hindcoxa setose dorsally;
BioStor
