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A revision of the genus Gymnetina Casey, 1915 (Coleoptera: Scarabaeidae: Cetoniinae: Gymnetini)
(2011)
The genus Gymnetina Casey (Coleoptera: Scarabaeidae: Cetoniinae: Gymnetini) is redescribed and revised. Three new species and one new subspecies are described: G. borealis Warner and Ratcliffe, G. grossepunctata Ratcliffe and Warner, G. howdeni Warner and Ratcliffe, and G. cretacea sundbergi Warner and Ratcliffe. Gymnetina salicis (Bates), new status, is removed from synonymy with G. cretacea (LeConte), and G. alboscripta (Janson) is transferred from Gymnetis MacLeay to Gymnetina becoming Gymnetina alboscripta (Janson), new combination. Redescriptions of previously known species, a key for identification, and illustrations of the six species are provided. A brief biogeographical analysis suggests that ancestral taxa dispersed northwards from Guatemala and Mexico to the southwestern United States.
Acoma howdenorum, Acoma westcotti, Acoma quadrilaminata, and Acoma cimarron (Coleoptera: Scarabaeidae: Melolonthinae), all new species, are described from Yuma County, Arizona, USA, and Baja California Sur, Baja California (Norte), and Sonora, Mexico, respectively. Habitus of the four new species is illustrated, and an updated key to the described species in the genus is provided. Distribution and variation of Acoma glabrata Cazier are also discussed.
Diagnostic characters of Glaresis mendica Horn are discussed, and an undescribed species, confused with G. mendica by authors subsequent to Horn, is described as Glaresis gordoni new species. A second new species, Glaresis zvirgzdinsi, is described from two isolated sand dunes in Yuma County, Arizona, USA. Diagnostic characters of the new species, as well as those of G. mendica, are illustrated.
The Orizabus Fairmaire (Coleoptera: Scarabaeidae: Dynastinae: Pentodini) of the USA are reviewed. Orizabus pinalicus new species and O. mcclevei new species are described. Lectotypes are here designated for eight species names: Bothynus pyriformis LeConte, Pseudaphonus lucidus Casey, Orizabus snowii Horn, Orizabus cultripes Fairmaire, Orizabus isodonoides Fairmaire, Orizabus sallei Fairmaire, Orizabus fontinalis Casey, and Orizabus ponderosus Casey. Illustrations of diagnostic characters and a key to the five included species are presented. The Mexican species O. isodonoides and O. rubricollis Prell are also illustrated for comparison to the new species.
Phyllophaga (Listrochelus) benwarneri new species and Cinacanthus cunninghami new species(Coleoptera: Scarabaeidae) are described from dune systems in northern Arizona and extreme southern Nevada, USA. Habitus and diagnostic characters of these species are illustrated, and couplets from the respective, most recent (sub)generic keys are modified to incorporate the new species. Available habits and habitat information for each species, and a discussion of the Phyllophaga “senex complex” of species are provided.
New World species of the histerid beetle genus Xestipyge Marseul (Coleoptera: Histeridae: Dendrophilinae: Paromalini) are reviewed, and X. skelleyi, new species, is described. A dichotomous key and illustrations are provided as identification means for the now five included species from the Western Hemisphere.