體長約43~46mm,雄蟲複眼為黑色或黑褐色,額部為白色,合胸為黑色,側面有2條不明顯的黃色斜紋,有些個體斑紋較明顯,腹部為黑色,第3、4節為白色,翅膀呈透明狀,翅端有褐色分布,翅痣為黑色,前翅基有少許褐色斑,後翅褐色斑面積大些。雌蟲額上方為暗褐色,腹部第3、4節為黃色,因此得名。未熟雄蟲外觀近似雌蟲,腹部第3、4節也是黃色,但可從腹側的黑斑辨識,雌蟲黑斑比較發達,尾毛較短。
分布於海拔1200公尺以下地區,成蟲出現於5至9月,雌蟲產卵於水面的枝條或浮木。
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