内蒙古襀翅目四新种

Four New Species of Plecoptera from Nei Mongol

记述了内蒙古翅目3个属4个新种（内蒙古纯Paragnetinaneimongolica,脊刺新Neoperladorsispina，双斑同Isoperlabimaculata，内蒙古同Isoperlaneimongolica）。

This paper deals with four new species of Plecoptera from Nei Mongol. The types of new species aremainly kept in the Insect Collections of China Agricultural University.1 Paragnetina neimongolica sp. nov. (fig. 1)Similar to P. indentata Wu & Claassen, but head with black ocellar triangle, male abdominal tergites 6- 8 with median process large and quadrate.Holotype 2, allotype l, paratype 1 t, Xingan Leaguc, Nei Mongol, l3- l8, VIl. 1983. Paratypes2 t t, same as holotype, 2O- 26. VII. l984.2 NeoPerla dorsisPina sp. nov. (fig. 2)Similar to N. fiavescens Chu, but head yellow with a black marking on ocel1ar triangle and frontcly-pus respectively; pronotum yellow with a middle stripe black.Ho1otype t, allotype l, paratypes 2 l l, Xingan League, Nei MongQl, l3 - 27. VII. 1983.Paratypel l, same as holotype, l1. VII. 1984.3 IsoPerla bimaclata sp. nov. (fig. 3)Similar to 1. hemitha1es Navas, but legs brownish yellowt female subgenital plate convex on the pos-terlor marg1n.Holotype 4, paratype l l, Xingan League, Nei Mongol, l3. VII. 19834 IsoPerla neimongolica sp. nov. (fig. 4)Similar to I. nigricauda Navds, but legs yelloew with femora and tibia blackish on the dorsal margin;antennae brown with yellow base, palpus dark yellow-Holotype t, Xingan League, 27. VI. l983.