In contrast to most Nematopogoninae which tend to be drab in color and crepuscular or nocturnal, the adults of Adelinae are often metallic and predominantly diurnal. The males of many species of Adela and Nemophora swarm, usually near the species' host plant or oviposition site. The enlarged compound eyes in these males are an adaptation for swarming (McAlpine and Munroe 1968, Downes 1969). The development of specialized, spinose setae and scales near the base of the antennae of swarming males may be further adaptations associated with this courtship behavior (Nielsen 1980), possibly for use in sound production or visual signaling (Bland 1977).
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