Coridromius

Body compact and stout, small, most species between 2–3 mm in length. Coloration variable, typically brown with various brown, yellow, and cream-colored markings; head often with contrasting dark brown or black above and yellow below, sometimes with irregular dark brown band on clypeus and a single dark brown spot on middle of vertex; frons tumescent medially, shallowly depressed adjacent to eyes; vertex usually with a pair of slightly raised tubercles adjacent to eyes, bordered posteriorly by shallow foveae; posterior margin of head weakly to strongly medially rounded. Antenna: first segment very short and cylindrical, approximately five times shorter than width of vertex. Pronotum broad and convex, anterolateral margins usually somewhat upturned, submarginal region of humeral angles shallowly excavate, collar present and rounded, visible from above, callar region either undifferentiated or weakly defined, lateral margins sometimes carinate. Scutellum sometimes with paired dark brown spots. Hemelytra often with brown transverse chevron pattern; costal margin thin and platelike in some species. Metathoracic gland external efferent system reduced, peritreme elongate, fingerlike. Legs: caudal margin of hind tibia with two rows of minute spines interspersed with longer spines. Abdomen sometimes with visible external paragenital modifications on right side. Surface and vestiture: head, pronotum, scutellum, propleuron, metepimeron, and hemelytra impunctate to punctate; broadly covered with short or long simple, white, decumbent setae. Male genitalia: left paramere larger than right, generally scythe-shaped, with gutter running from base to apex; right paramere smaller, triangular and somewhat elongate, apically acuminate; aedeagus simple, membranous, without sclerotizations.

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