The Pseudichnea complex involves the genera Ambitus, new genus, Ampleris, new genus, Sirpa, new genus, and Pseudichnea Schenkling. Ambitus includes one species, A. anticus Opitz, new species. Ampleris includes A. achira Opitz, new species, A. angustata Opitz, new species, A. cava Opitz, new species, A. orosi Opitz, new species, A. primitura Opitz, new species, A. rufocapilla Opitz, new species, and A. buenavista Opitz, new species. Pseudichnea includes P. acia Opitz, new species, P. arima Opitz, new species, P. eliminata Schenkling, and P. gracila Opitz, new species. Sirpa includes S. cauda Opitz, new species, S. flavoapiculis Opitz, new species, and S. skelleyi Opitz, new species. Morphological observations, particularly those based on mouthpart structure, suggest that these beetles are predatory. Their leg construction, especially development of the tarsal pads and ungues, suggest that they are lignicolous beetles that inhabit the woody components of arboreal vegetation, a niche in which they presumably pursue bark-beetle prey. Besides descriptions, this treatise includes a key to genera and species, 72 line drawings, eight electron micrographs, 16 habitus illustrations, and two distribution maps.
