Definition: Nyctiophylax is a genus of moths in the family Erebidae, commonly known as the black widow moth or nightmarish moth. This species belongs to the subfamily Nepticulare and is found throughout North America, from Alaska to southern California, including parts of Mexico. Nyctiophylax is characterized by its distinctive yellow-green wings that can be both bright and dark in coloration. The thorax (upper body) is generally brown or black
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