Biological species problems in some Tetramesa (Hymenoptera, Eurytomidae)

Using horizontal starch gel electrophoresis, ten enzyme systems were surveyed in ten populations of Tetramesa reared from eight species of grass collected from different sites in Britain. Eight species of Tetramesa were recognized on the basis of the number and relative mobilities of electromorph bands for larvae, pupae and adults. No differences were found between populations of T. hyalipennis (Walk.) reared from Elymus repens (L.) and E.farctus (Viv.) or between populations of T. eximia (Gir.) reared from Calamagrostis epigejos (L.) Roth and Ammophila arenaria (L.) Link. Experiments on mate-choice and host preference also supported the electrophoretic results for populations of T. hyalipennis and T. eximia.     

竹子新害虫——木竹泰广肩小蜂

木竹泰广肩小蜂Tetramesa cereipes Erds为我国1新记录种,在北京市紫竹院公园发现危害巴山木竹的嫩竹枝,受害竹枝形成多室虫瘿。该小蜂在北京1年发生1代,11月下旬以老熟幼虫在寄主虫瘿内过冬,翌年3月下旬起化蛹,4月初为化蛹高峰期。4月中旬开始羽化,5月初盛发,5月下旬终止。幼虫为害期从6月中旬到11月下旬止。此外,还描述各虫态的形态特征。