Abstract
Twenty-one species of Atrichopogon are described from Costa Rica, based primarily on distinctive males. Of these, females are also described for six species. A key to the males of these species allows for their identification within at least the New World. Three of the species are previously named and described: A. lacajae Macfie, A. didymothecae Macfie, and A. longicornis Ewen. The following are new species: A. bicuspis, A. colossus, A. spinosus, A. carnatus, A. lobatus, A. magnus, A. granditibialis, A. barbatus, A. yolancae, A. gamboai, A. granditergitus, A. tirzae, A. asuturus, A. quartibrunneus, A. beccus, A. redactus, A. setosilateralis, and A. tapantiensis. A lectotype is designated for A. didymothecae.
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