體長約10~11mm。成蟲體從小型到大型都有。頭部寬大,複眼大,觸角短。體寬或纖細,體色單一暗色或常有黄、橙、灰白等鮮豔色彩的斑紋,某些種類有藍、綠、銅等金屬色。
分布於低海拔平地與山區。幼蟲以蚜蟲、介殼蟲等同翅目小型昆蟲為食,故名「食蚜蠅」。成蟲喜好訪花。多數的食蚜蠅身上的斑紋、色彩都擬態成蜜蜂,並與蜜蜂在相同的環境訪花吸蜜,仔細看食蚜蠅身體較扁平,採蜜之前喜歡於空中停格振翅飛行容易分辨。食蚜蠅在花朵上取食,先將舐吮式的口器伸出,然後在花朵上吸蜜,花粉沾滿牠的頭部、口器、眼和腳,牠們就用前腳不斷的擦拭口器、眼睛,相當可愛。
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