广西棘膝大蚊属二新种(双翅目:大蚊科)

Two New Species of Holorusia Loew from Guangxi(Diptera: Tipulidae)

双翅目大蚊科(Tipulidae)的棘膝大蚊属(Holorusia Loew)包括本科体型最大的种类(翅展可达100mm左右),世界已知近百种,主要分布在东洋区,有63种及2亚种。我国四川5种,广东1种。海峡两岸各3种;广西此属为新记录,在此记述2新种,模式标本收藏在北京农业大学昆虫标本室。棘膝大蚊属很长时期均采用Ctenacroscelis Enderlein属名,Vane-Wright(1967)证明是Holorusia的异名,Alexander(1971)也讨论了此属的情况。

This paper deals with two new species of the genus Holorusia Loew from Guangxi Province. The types of new species are kept in the Insect Collations of Beijing Agricultural University. 1. Holorusia incurvata Yang et Yang, sp. nov. (fig. 1～4) Similar to H. nimba(Alexander)from Sichuan, but outer margins of prescutum markings with consistent brownish. Holitype ♂, paratypes2 ♂ ♀, Guangxi: Longsheng, 1963—Ⅵ-4/5, Yang Chikun. 2. Holorusia basiflava Yang et Yang, sp. nov. (fig. 5～6) Similar to H. pluto(Brunetti)from Vietnam, but prescutum with three black stripes, scutellum yellow, and postnotum yellow with Lateral and posterior margins brown. Holotype ♂, Guangxi: Longsheng, 1963—Ⅵ—4, Yang Chikun. Paratype 1 ♂, Guangxi: Longsheng, 1963—Ⅵ—7, Yang, Chikun.