PROC. ENTOMOL. SOC. WASH. 87(1). 1985, pp. 191-201 TWO NEW SPECIES, LARVAL DESCRIPTIONS. AND LIFE HISTORY NOTES OF SOME PANAMANIAN SAWFLIES (HYMENOPTERA: ARGIDAE, TENTHREDINIDAE) Lynn Siri Kjmsey and David R. Smith (LSK) Department of Entomology, University of California, Davis, California 95616; (DRS) Systematic Entomology Laboratory, IIBIIL Agricultural Research Service, USDA, % National Museum of Natural History, Washington, D.C. 20560. Abstract. — Larvae are described and biological notes and hosts are presented for five species of Symphyta from Panama, two of which are new. Four species are argids: Didymia unifasciata Smith, n. sp. (on Rouria glabra), Manaos kimseyae Smith, n. sp. (on Inga phagifolium), Sericoceros gibbus (KJug) (on Coccoloba manzanillensis), and Ptilia concinna (Klug) (on Cnestidium rufescens). One species IS a tenthredinid: Erythraspides interstitialis (Cameron), n. comb, (originally in Monophadnus) (on Hametia patens). The larvae of each species and the adult characters for the two new species are illustrated. Host plants and larvae of very few Neotropical sawflies are known. Four argids and one tenthredinid species were reared by the senior author from woody plants on Barro Colorado Island in the Zona del Canal, Panama. The larvae are described and available biological information on them is noted. The reared adults were identified by the junior author, who describes the two new species and supplies all the taxonomic information. All specimens, except for a few paratypes, are deposited in the Entomology Museum of the University of California, Davis, and the National Museum of Natural History, Washington, D.C. Argidae The following two new species are remarkably similar in general appearance and coloration, but belong to different genera. The length of the antenna will readily separate the two genera, that of Manaos being long, slender, tapering toward its apex, and its length more than twice the head width, and that o^ Didymia being short, mostly of uniform width throughout, with its length less than 1.5 x the head width. Other differences between the two genera are as follows: the shape of the last closed cubital cell of the forewing. which is nearly square or slightly longer on the cubitus than on the radius in Manaos. and much longer on the radius than on the cubitus in Didymia: the sharp interantennal carina in Manaos and the rounded interantennal carina in Didymia; and the absence of or very short accessory vein at the apex of the radial cell in the forewing in Manaos and the long accessory vein in Didymia. which is nearly one-fifth the length of the radial cell. Both genera are separated from others in the Argidae by the following:
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