负蝽科（学名：Belostomatidae），属于半翅目的水生昆虫，常称作「巨型水虫」（Giant Water Bugs）、「咬脚趾虫」（toe-biter），但因常有强烈的趋光性也称作「电光虫」（electric-light bugs），牠们也是全球半翅目中最大的昆虫，也能用上翅的翅膀进行飞行。通常会在淡水溪流与池塘出现，大多数种类相当的大，例如：大田鳖，平均超出了4.75英吋，相当于世界最大甲虫的尺寸，在泰国也具有食用性用途。

Belostomatidae is a family of freshwater hemipteran insects known as giant water bugs or colloquially as toe-biters, Indian toe-biters, electric-light bugs, alligator ticks, or fleas (in Florida). They are the largest insects in the order Hemiptera, and occur worldwide, with most of the species in North America, South America, Northern Australia, and East Asia. They are typically encountered in freshwater streams and ponds. Most species are relatively large, typically at least 0.75 in (2 cm) long, although smaller species also exist. The largest are members of the genus Lethocerus, which can exceed 4.75 in (12 cm) and nearly reach the length of some of the larger beetles in the world. Giant water bugs are a popular food in certain countries in southeast Asia.