A taxonomic revision of the genus Scybalocanthon Martínez, 1948 (Coleoptera Scarabaeidae: Scarabaeinae: Deltochilini) Author Silva, Fernando A. B. Universidade Federal do Pará, Instituto de Ciências Biológicas, setor de Zoologia, Campus Belém. Rua Augusto Corrêa, 01. Guamá. Belém PA 66075 - 110, Brazil. E-mail: fernandoabsilva @ yahoo. com. br Author Valois, Marcely Programa de Pós-graduação em Zoologia, Universidade Federal do Pará / Museu Paraense Emílio Goeldi. Rua Augusto Corrêa, 01. Guamá. Belém PA 66075 - 110, Brazil. text Zootaxa 2019 2019-07-08 4629 3 301 341 journal article 21174 10.11646/zootaxa.4629.3.1 9419bc9b-dbe4-426c-a34e-f0034848ff99 1175-5326 3995508 1D47B452-0A40-4BC5-9BBA-C06DEB298C9A Scybalocanthon adisi Silva & Valois , new species ( Figs. 1B , 4B , 5B , 6A ) Etymology. Named in honor of Dr. Joachim Adis, who collected some of the type specimens. Diagnosis . Specimens of S. adisi ( Fig. 1B ) are similar to those of S. aereus ( Fig. 1C ) in body coloration; aedeagus with parameres elongate, subrectangular, not excavated ventrally ( Figs. 4 B–C); and endophallus lacking bristles or microbristles close to the FLP sclerite ( Figs. 5 B–C). However, S. adisi can be easily distinguished by the lack of a carina at the anterior portion of the eighth elytral stria. Description. Body. Oval, lateral edges rounded. Surface opaque, completely microgranulate. Color . Pronotum, hypomera (except internal margin), metaventrite, abdominal ventrites, pygidium, middle of femora, and tibiae yellow or light brown. Head, internal margin of hypomera, prosternum, mesoventrite, mesoepisternae, metaepisternae, elytra, trochanters, and proximal and distal portions of femora dark brown. Length. 6.0– 8.9 mm . Thorax . Anterior angles of pronotum acute (approximately 85°). Lateral margin regularly curved outward, not forming an angle at the middle portion. Elytra . Striae thin and opaque, weakly impressed, punctures inconspicuous. Interstrial surface with ocellar punctures, microgranulate. Eighth stria effaced at the basal third, lacking carina at the anterior portion. Aedeagus. Parameres symmetrical and elongate, with subrectangular shape, truncate apically ( Fig. 4B ). Dorsal and ventral margins of parameres substraight. SRP circular, with substraight handle-shaped extension ( Fig. 5B ). FLP I-shaped ( Fig. 5B ). A+SA with two superposed and elongate sclerites ( Fig. 5B ). AS as in Fig. 5B . Type material. Holotype . BRAZIL : AMAZONAS : Rio Taruma Mirim NW Manaus , 24.xi.1976 , J. Adis— 1♂ ( CEMT ) . Paratypes . BRAZIL : AMAZONAS, Ega [= Tefé ] ( 3°22’S , 64°42’W ), [no date], [anonymous]— 1♂ ( CMNC ) ; Rio Tarumã Mirim , NW Manaus ( 3°0’58’’S , 60°10’30’’W ), 13.i.1977 , J. Adis— 1♂ ( CMNC ) ; Rio Ta- rumã Mirim , NW Manaus ( 3°0’58’’S , 60°10’30’’W ), 16.ii.1977 , J. Adis— 1♂ ( CMNC ) ; Rio Tarumã Mirim , NW Manaus ( 3°0’58’’S , 60°10’30’’W ), 27.iv.1977 , J. Adis— 1♂ ( CMNC ) ; Rio Tarumã Mirim , NW Manaus ( 3°0’58’’S , 60°10’30’’W ), 11.v.1977 , J. Adis— 1♀ ( CMNC ) ; Rio Tarumã Mirim , NW Manaus ( 3°0’58’’S , 60°10’30’’W ), 8.ii.1977 1♀ ( CEMT ) . ECUADOR : PASTAZA : Lorocachi , 220 m , 16–27.ii.1996 , Mayala C. Carpio— 1♀ ( CEMT ) . Distribution. Known from Brazil (Amazonas) and Ecuador ( Fig. 6A ). Endemism areas : Brazilian sub-region : Boreal Brazilian dominion: Napo and Imerí provinces (see Morrone 2014 ; fig. 12).