Thermonectus Nigrofasciatus on:
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''Thermonectus nigrofasciatus'' is a species of 
diving beetle
The Dytiscidae – based on the Greek ''dytikos'' (δυτικός), "able to dive" – are the predaceous diving beetles, a Family (biology), family of water beetles. They occur in virtually any freshwater habitat around the world, but a ...
native to the eastern United States. ''T. nigrofasciatus'' is distinguished by its black, postmedian transverse blotch on its elytra, hence "nigrofasciatus."
References
{{DEFAULTSORT:Thermonectus nigrofasciatus Dytiscidae Beetles of North America Beetles described in 1838 Taxa named by Charles Nicholas Aubé