Female horseflies suck the blood of people and livestock.
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usage
虻 is a large biting fly. The everyday word is 牛虻 niúméng (literally 'ox-fly', the horsefly). Only the female bites mammals for blood; the compound 蚊虻 wénméng lumps it with mosquitoes as bloodsucking pests.
Right is 亡, an old phonetic that shifted to méng. The fuller traditional form wrote two 虫 over 亡; the modern shape keeps just one insect plus the sound element.
