寄生钻蛀害虫的瘦角姬蜂属(膜翅目,姬蜂科)二新种及中国已知种检索表

报道寄生天牛的瘦角姬蜂属Ischnoceros Gravenhorst,1829 2新种:天牛瘦角姬蜂I.eutetraphae sp.nov.,寄生直脊天牛Eutetrapha sedecimpunctata(Motschulsky) ;松瘦角姬蜂I.laricinus sp.nov.,寄生云杉花墨天牛Monochamus saltuarius Gebler。编制了中国已知种检索表。天牛瘦角姬蜂,新种Ischnocero s eutetraphae sp.nov.(图1 ~3)新种与北海道瘦角姬蜂I.sapporensis Uchida,1928 ,相近,可通过下列特征区别:并胸腹节基区与中区由横脊分隔,侧突高为触角第2鞭节直径的1.5 ~1.6倍;腹部第2节背板具横细纹;翅基片褐色;中足基节大部分为红褐色;中足腿节红褐色或主要为红色。北海道瘦角姬蜂:并胸腹节基区与中区合并,无横脊分隔,侧突高约等于触角第2鞭节直径;腹部第2节背板具刻点;翅基片褐黑色;中足基节和中足腿节黑色。正模♀,辽宁新宾, 546m, 2005-08-20 ,盛茂领。副模: 1♀,辽宁新宾, 546m, 2005-06-09 ,盛茂领; 1 ♂,吉林伊通, 336m,2005-05-17 ,盛茂领。寄主:直脊天牛Eutetrapha sedecimpunctata(Motschulsky)。寄主植物:紫椴Tilia amurensis Rupr.。松瘦角姬蜂,新种Ischnoceros laricinus sp.nov.(图4 ~7)本种与三峡瘦角姬蜂I.sanxiaensis Wang,1997相近,可通过下列特征区别:并胸腹节第1侧区具清晰的斜纵皱;腹部第3 ~6节背板具横细纹;产卵器鞘长为后足胫节长的1.4~1.6倍;产卵器腹瓣端部,在脊的内侧具1粗糙区。三峡瘦角姬蜂:并胸腹节第1侧区具清晰的刻点;腹部第3 ~6节背板具稠密的刻点;产卵器鞘长约为后足胫节长的1.1倍;产卵器腹瓣端部无粗糙区。正模♀,吉林大兴沟, 586m, 2005-07-02 ,盛茂领。副模: 1♀,1 ♂,吉林大兴沟, 586m, 2005-07-01 ~03 ,盛茂领; 1 ♂,辽宁新宾, 546m, 2005-06-10 ,盛茂领; 1♀,3 ♂♂,辽宁本溪, 418m, 2006-06-20 ,盛茂领。寄主:云杉花墨天牛Monochamus saltuarius Gebler。寄主植物:兴安落叶松Larix gmelinii(Rupr.)Rupr.。瘦角姬蜂属中国已知种检索表1.额具稠密的横皱……………………………………………………2额无皱………………………………………………………………32.并胸腹节基部中央具1半圆形深凹,基区两侧的纵脊平行;产卵器腹瓣端部,在纵脊的内侧具1段粗糙的纵带;后足腿节黑色……………………………暗足瘦角姬蜂I.pedipullus Sheng并胸腹节基部中央无半圆形凹,基区两侧的纵脊向前强烈分散;产卵器腹瓣光滑,无粗糙的纵带;后足腿节红色赤足瘦角姬蜂I.rusticus(Geoffroy)…………………………………………3.腹部第3 ~6节背板具稠密的刻点三峡瘦角姬蜂I.sanxiaensisWang………………………………………………………………腹部第3 ~6节背板具稠密的细横线纹…………………………44.产卵器腹瓣端部,在纵脊的内侧具1段粗糙的纵带松瘦角姬蜂,新种I.laricinus sp.nov.……………………………………产卵器腹瓣光滑,无粗糙的纵带…………………………………55.腹部第1节背板的中纵脊至少伸抵气门;第2节背板具清晰的横线纹;基节具较大的红褐斑;中足腿节红褐色或主要为红色天牛瘦角姬蜂,新种I.eutetraphae sp.nov.………………………腹部第1节背板的中纵脊至多伸达基部至气门的一半;第2节背板无横线纹;基节黑色;中足腿节黑色………………………………………北海道瘦角姬蜂I.sapporensis Uchida

TWO NEW SPECIES OF THE GENUS ISCHNOCEROS GRAVENHORST (HYMENOPTERA, ICHNEUMONIDAE) PARASITIZING WOODBORERS WITH A KEY TO SPECIES OF ISCHNOCEROS KNOWN IN CHINA

Two new ichneumonid species reared from cerambycids are described: Ischnoceros eutetraphae sp. nov. from Eutetrapha sedecimpunctata (Motschulsky), wood borer of the tree Tilia amurensis Rupr. and Ischnoceros laricinus sp. nov. from Monochamus saltuarius Gebler (Cerambycidae), wood borer of the tree Larix gmelini (Rupr.) Rupr. A key to the species of Ischnoceros known in China is provided.