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''Benacus griseus'' is a species of giant water bug in the family 
Adults reach lengths of 47–64 mm, making them one of the largest aquatic insect species found in eastern North America.
It is distinguished from other Lethocerinae species by the lack of a groove on its front femur. It is also characterized by a wide hind tibia and black ventral stripes.
Belostomatidae
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 alligator fleas (in Florida). They are the largest insects in the or ...
. It is the only species in the genus '' Benacus'', which was formerly considered a subgenus of ''Lethocerus
''Lethocerus'' is a genus of the hemipteran family Belostomatidae, known colloquially as giant water bugs, toe biters and electric light bugs, distributed in tropical, subtropical and temperate areas of the world. The greatest diversity of speci ...
''.
''Benacus griseus'' is found throughout eastern North America, from New England, west through southern Ontario and to Nebraska, south to Florida and Texas, along the Gulf of Mexico coast in Mexico, and into Cuba.
Adults reach lengths of 47–64 mm, making them one of the largest aquatic insect species found in eastern North America.
It is distinguished from other Lethocerinae species by the lack of a groove on its front femur. It is also characterized by a wide hind tibia and black ventral stripes.
References
Belostomatidae Insects described in 1832 Taxa named by Thomas Say Hemiptera of North America {{Nepomorpha-stub