Larvae of Neotropical Coleoptera. VI. Scarabaeidae, Dynastinae, Phileurini

The third instar larva and the pupa of Homophileurus luedcrwaldti (Ohaus, 1910) and Trioplus cylindricus (Mannerheim, 1829), collected in southern Brazil and rearead in laboratory, are described and illustrated.A short description of the larva of Actinobolus trilobus Luederwaldt, 1910, is also included.A set of larval characteristics for the Phileurini is provisionally provided.Immatures of T. cylindricus are found in decayed logs.Immatures of A. trilobus feed on Nasutitermes carton nests (Luederwaldt, 1911).Immatures and adults of H. luedcrwaldti are found inside carton nests of Microccrotcrmcs sp.n. and Nasutitermes sp.n.; larval feeding may hollow the center of the nest and even result in the nest destruction; pupation occurs inside nest walls; the nes" seems to constitute the main feeding source and an adequate place for the development of the beetle.