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离颚茧蜂Dacnusa sp.为大豆根潜蝇Melanagromyza sp.的寄生性天敌,目前在国内尚未见报导。1979～1981年我们对其生活史、寄生率和发生规律等进行了研究,现将材料整理如下。一、形态特征成蜂体长2.3～2.5毫米,翅展4毫米左右。体黑褐色,有光泽,头、胸部及腹部后方有稀疏细毛;触角丝状,长于体长,29节,黑褐色,柄节粗大,各节间有毛;上颚具二齿,上颚可向外反转,在闭合时二者不相遇;下颚须5节;翅透明,具金黄色闪光,前翅仅一条肘间横脉,即有1个封闭的肘室,翅痣狭长,超过径室中央,径脉从翅痣基部伸出,肘脉外半消失;足桔黄色,跗节末节暗黑色。
Dacnusa sp., A parasitic natural enemy of Soybean Melanagromyza sp., Has not been reported in China at present. From 1979 to 1981, we conducted a study on its life history, parasitism rate and occurrence patterns, etc., and we now organize the materials as follows. First, the morphological characteristics into a bee body length 2.3 ~ 2.5 mm, wingspan about 4 mm. Body dark brown, shiny, head, chest and abdomen rear sparse hairs; antennae filamentous, longer than the body length, 29 knots, dark brown, coarse knots, the joints have hair; upper jaw with two teeth, the upper jaw can be outward Reverse, closed in the time the two do not meet; jaw to 5; wings transparent, with a golden flash, the forewing only a transverse coronary artery, that is, a closed elbow room, Radial veins from the base of the mole sticking out, the outer half of the disappearance of the elbow vein; foot orange yellow, nodular dark end.