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Euparthenos nubilis
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The Locust Underwing (''Euparthenos nubilis'') is a species of moth in the Erebidae family and the only member of its genus ''Euparthenos''. The adults resemble some of the underwing moths of genus ''Catocala'', which are fairly close relatives, in color, pattern, and the habit of resting on tree trunks. But ''E. nubilis'' can usually be immediately recognized by the 4 concentric black bands per hindwing, as opposed to one or two (at most 3) in ''Catocala''. Color morphs of ''E. nubilis'' with altered pattern are known, however, and these may be hard to recognize without detailed examination.〔Nelson & Loy (1983), and see references in Savela (2001)〕
This moth has light grey forewings with a pattern of darker grey and brown lines and shading. The hindwings are yellow-orange with the aforementioned four black bands each. The wingspan is 56–70 mm (over 2 to almost 3 inches.〔BugGuide (2011)〕
The species is found from Maine, Ontario and Quebec, south to northern Florida, west to Nebraska and Arizona. Adults are on wing from April to September. There are two generations per year. The larvae feed on ''Robinia'' (locust tree) species, such as Black Locust (''Robinia pseudoacacia''). The adults like to drink the juice of fermenting fruit, and are attracted to lights.〔
==Systematics and taxonomy==
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