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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