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Published online by Cambridge University Press: 31 May 2012
The species ol the genus Matus are as yet known only from America north of Mexico and may be separated from all other Dytiscidae of this area by the following combination of characters: Length 7 to 9.5 mm.; color brownish-red to piceous; scutellum visible; eyes emarginate above the bases of the antennae; metatarsal claws of unequal length; prosternum and its process on a plane, almost flat, and with a longitudinal median sulcus.