A revision of the genus Sclerocoelus Marshall (Diptera: Sphaeroceridae)

The widespread but mostly Andean genus Sclerocoelus Marshall, 1995 is revised and redescribed, and the following 48 new species are described: S. aduncus sp. nov. (Ecuador), S. alpinus sp. nov. (Ecuador, Venezuela), S. altus sp. nov. (Ecuador), S. argentinensis sp. nov. (Argentina), S. azulensis sp. nov. (Ecuador), S. binus sp. nov. (Bolivia, Costa Rica, Ecuador, Peru, Venezuela), S. bucki sp. nov. (Bolivia, Costa Rica, Ecuador, Peru), S. caligarius sp. nov. (Bolivia), S. chilensis sp. nov. (Chile), S. copiosus sp. nov. (Bolivia, Brazil, Costa Rica, Ecuador, Panama, Peru, Venezuela), S. costaricensis sp. nov. (Costa Rica), S. cubus sp. nov. (Ecuador, Peru), S. dasysternum sp. nov. (Costa Rica, Guatemala, Honduras, Panama, Tobago), S. dominicensis sp. nov. (Dominica), S. dryadalis sp. nov. (Venezuela), S. elephas sp. nov. (Bolivia, Ecuador, Venezuela), S. espeletia sp. nov. (Venezuela), S. flavus sp. nov. (Venezuela), S. frigidifrons sp. nov. (Ecuador), S. grandicercus sp. nov. (Costa Rica), S. inornatus sp. nov. (Ecuador), S. irregularis sp. nov. (Argentina, Bolivia, Brazil, Costa Rica, Ecuador, Paraguay), S. latibarbus sp. nov. (Guatemala, Honduras, Mexico), S. lazulita sp. nov. (Bolivia, Ecuador, Venezuela), S. limbus sp. nov. (Bolivia, Peru), S. longibarbus sp. nov. (Costa Rica, Guatemala, Mexico), S. lutosus sp. nov. (Bolivia, Peru), S. mandibulum sp. nov. (Bolivia, Ecuador), S. masneri sp. nov. (Venezuela), S. meridensis sp. nov. (Venezuela), S. nebulosus sp. nov. (Costa Rica, Ecuador, Venezuela), S. nitidistylus sp. nov. (Costa Rica, Panama), S. ocellatus sp. nov. (Costa Rica), S. paranebulosus sp. nov. (Venezuela), S. pararegularis sp. nov. (Mexico), S. parasordipes sp. nov. (Canada, Mexico, USA), S. penai sp. nov. (Bolivia), S. punensis sp. nov. (Bolivia, Peru), S. puyensis sp. nov. (Ecuador), S. recurvatus sp. nov. (Costa Rica), S. riparius sp. nov. (Ecuador), S. rostrum sp. nov. (Mexico), S. synorios sp. nov. (Mexico, USA), S. tantus sp. nov. (Argentina, Bolivia, Brazil, Ecuador, Peru, Paraguay, Venezuela), S. tridens sp. nov. (Bolivia, Ecuador), S. turpis sp. nov. (Brazil), S. vulgatus sp. nov. (Costa Rica, Guatemala, Honduras, Mexico, Nicaragua, Panama, Peru), and S. xynos sp. nov. (Argentina, Bolivia, Ecuador, Peru, Venezuela). A key to species is provided, along with discussions of the relationships, distribution, and biology.