Taxonomic revision of the Deltohyboma Lane, 1946 gilli species group (Coleoptera: Scarabaeidae: Scarabaeinae: Deltochilum) Author González-Alvarado, Arturo 2D58A702-73A9-4C66-8CED-6B8B9A2AB10B Programa de Pós-graduação em Ecologia e Conservação da Biodiversidade, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso, Brazil. fagakorn@gmail.com Author Vaz-De, Fernando Z. 2FF2B7D6-1A6B-43C1-9966-A1A949FB2B05 Instituto de Biociências, Departamento de Biologia e Zoologia, Universidade Federal de Mato Grosso, Cuiabá, Mato Grosso, Brazil. vazdemello@gmail.com text European Journal of Taxonomy 2021 2021-10-20 775 86 106 journal article 3948 10.5852/ejt.2021.775.1551 cc10c087-bec3-4947-81d7-b3e5580a5c94 2118-9773 5589689 976D7020-5904-4951-97CE-B4FE58DA12A8 Deltochilum gilli González-Alvarado & Vaz-de-Mello, 2021 Figs 1A , 2A , 3A , 4A , 5A , 6A , 7A , 8A , 9A–B , 10 Deltochilum gilli González-Alvarado & Vaz-de-Mello, 2021: 50 , figs 26c, 28. Diagnosis Elytra with apical tubercles on interstriae III–VII ( Fig. 5A ), first stria almost twice as wide as than second stria, striae III–VII subequal in width and conspicuous ( Figs 1A , 4A ) and sub-medial area of endophallus with elongate scales ( Fig. 8A , arrow) distinguish this species (for a complete description see González-Alvarado & Vaz-de-Mello 2021 ). Fig. 5. Caudal view of mmbers of the gilli species group. A . Holotype of Deltochilum gilli González- Alvarado & Vaz-de-Mello, 2021, CNCI 379888. B . Holotype of D. jocelynae sp. nov. , CNCI 379889. C . Holotype of D . nonstriatum sp. nov. , CMNEN WSD00041746. D . Holotype of D . quasistriatum sp. nov. , CMNEN WSD00041744. E . Holotype of D . tenuistriatum sp. nov. , CMNEN WSD00041745. Material examined Holotype GUYANA • 1 ♂ ; District 8 , Mount Wokomung ; 5º06′34.8″ N , 59º49′15.3″ W ; alt. 1234 m ; 27 Oct.–1 Nov. 2004 ; B. Hubley leg.; pitfall trap (human dung), primary forest ; ROM 2004516; BDGC . [aedeagus and endophallus extracted]; CNC 379888 . Paratype GUYANA • 1 ♀ ; same collection data as for preceding; BDGC . Fig. 6. Ventral view of members of the gilli species group. A . Holotype of Deltochilum gilli González- Alvarado & Vaz-de-Mello, 2021, CNCI 379888. B . Holotype of D. jocelynae sp. nov. , CNCI 379889. C . Holotype of D . nonstriatum sp. nov. , CMNEN WSD00041746. D . Holotype of D . quasistriatum sp. nov. , CMNEN WSD00041744. E . Holotype of D . tenuistriatum sp. nov. , CMNEN WSD00041745. Remarks Within D . ( Deltohyboma ) only few species which possess the anterior margin of clypeus expanded posteriorly into a triangular shape have more than four elytral apical tubercles. Frequently, in species bearing over four apical tubercles, the anterior margin of the clypeus is not expanded into a triangular shape. D . gilli is one of those few exceptions. Known distribution Guyana . District 8, Mount Wokomung. ( Fig. 10 , blue circle).