An annotated checklist of the Scarabaeoidea (Insecta: Coleoptera) of the Guianas Author Hielkema, Auke J. Author Hielkema, Meindert A. text Insecta Mundi 2019 2019-10-25 732 732 1 306 journal article 10.5281/zenodo.3678492 8e18452b-1d9d-462e-bac8-8c86eeb4ddc3 1942-1354 3678492 930EAB11-37FA-41B0-980A-1A4736527842 Onthophagus clypeatus Blanchard, 1846 Onthophagus clypeatus Blanchard 1846: 182 ( Bolivia ) Distribution. Guyana : Forsyth and Gill 1993: 70 . Suriname : MHCN - NEW COUNTRY RECORD (Suriname, Sipaliwini , eastern bank Corantijn opposite Arapahu Resort, ( 3°27′N , 57°37.5′W ). 15/ 21-II- 2011 . A. J. Hielkema. In pitfall with human excrements in forest.); NZCS; RMNH. French Guiana : Boucomont 1932: 322 ; Balthasar 1941c: 352 ; Price and Feer 2012: 327 ; MHCN. “Guianas”: Pulido Herrera and Zunino 2007: 99 . Brazil : Pulido Herrera and Zunino 2007: 99 . Venezuela : Pulido Herrera and Zunino 2007: 99 . Other: Blanchard 1846: 182 (Bolivia); Gillet and Boucomont 1927: 205 (Bolivia); Boucomont 1932: 322 (Bolivia, Colombia, Ecuador, Peru); Balthasar 1941c: 352 (Bolivia, Colombia, Ecuador, Peru); Blackwelder 1944: 211 (Bolivia); Medina et al. 2001: 139 (Colombia - as O. clypeataus [sic]); Pulido Herrera and Zunino 2007: 99 (Bolivia, Colombia, Ecuador). Note. Onthophagus clypeatus and O. xanthomerus are suspected to be different forms of the same species in Boucomont (1932: 299) (see the note at the bottom of that page) and in Balthasar (1941c: 352) . In Blackwelder (1944: 211 , 212) these forms were treated as separate species. According to Boucomont (1932: 299) , the forms are distinguished by the pronotum being matte ( O. clypeatus ) or shiny ( O. xanthomerus ). We have collected a male Surinamese specimen in which the posterior half of the pronotum is matte and the anterior half shiny, which has led us to adopt the view of Boucomont (1932) . We have thus placed all our specimens under the senior name O. clypeatus . Otherwise, we have entered both names separately on this checklist because they are distinct species according to Zunino (1981: 81) . To our knowledge the matter has not been given attention since Zunino (1981) .