Zootaxa 5027 (3): 387–407 ISSN 1175-5326 (print edition) https://www.mapress.com/j/zt/ Article ZOOTAXA Copyright © 2021 Magnolia Press ISSN 1175-5334 (online edition) https://doi.org/10.11646/zootaxa.5027.3.5 http://zoobank.org/urn:lsid:zoobank.org:pub:0B8E6B3B-3F14-4959-AB39-ADF60E98EE43 Giant water scavenger beetles Hydrophilus subgenus Dibolocelus (Coleoptera: Hydrophilidae) from Mexico with description of two new species ROBERTO ARCE-PÉREZ1, EMMANUEL ARRIAGA-VARELA2*, RODOLFO NOVELO-GUTIÉRREZ1 & JOSÉ L. NAVARRETE-HEREDIA2 1Instituto de Ecología, A.C., Red de Biodiversidad y Sistemática, Carretera Antigua a Coatepec, 351, El Haya, 91070, Xalapa, Veracruz, Mexico.
[email protected]; https://orcid.org/0000-0002-7714-6943
[email protected]; https://orcid.org/0000-0003-3163-2820 2Centro de Estudios en Zoología, CUCBA, Universidad de Guadalajara, Apdo. postal 134, Zapopan, Jalisco, Mexico.
[email protected]; https://orcid.org/0000-0002-3336-8528 *Corresponding author.
[email protected]; https://orcid.org/0000-0001-6206-9212 Abstract The Hydrophilus (Dibolocelus) Bedel species from Mexico and adjacent areas are treated on the basis of the study of 142 adult specimens and published data. Two new species are herein recognized and described: H. (D.) nucleoensis Arce-Pérez & Arriaga-Varela sp. nov. from Mexico, Guatemala and Nicaragua, H. (D.) pseudovatus Arce-Pérez & Ar- riaga-Varela sp. nov. from Mexico. Three already known species are re-described and their geographical distribution is updated, H. (D.) ovatus Gemminger & Harold and H. (D.) pollens Sharp and H. (D.) violaceonitens Jacquelin du Val, a species resurrected as distinct to H. (D.) smaragdinus. Hydrophylus (D.) cf.