Philonthus bonariensis Bernhauer

(Figs. 18, 51)

Diagnosis (based on Chani-Posse 2010). Philonthus bonariensis may be identified by the coloration pattern of the elytra, castaneous with medial and apical margins lighter or uniformly coloured (brunneous to testaceo-brunneus); the antennal segments 4 elongate and 5 quadrate, the last segment of labial palpi 2 times as long as the second, and the tergum 10 with 5 to 6 apical setae in both sexes. It differs from other southern South American species of Philonthus by the median lobe with a small tooth on the face adjacent to paramere, and the paramere elongate with 6–8 peg setae forming two short lateral rows at apex. Length 6.0–7.0 mm.

Distribution. Brazil, Paraguay, Uruguay, Argentina, Chile (Chani-Posse 2010).

Bionomics. Philonthus bonariensis has been frequently found in cow droppings in open and wooded habitats, litter near rivers and streams, and under rocks (Chani-Posse 2010).