Onthophagus etlaensis, Arriaga-Jiménez & Escobar-Hernández & Rös & Kohlmann, 2020

Arriaga-Jiménez, Alfonsina, Escobar-Hernández, Fernando, Rös, Matthias & Kohlmann, Bert, 2020, The establishment of the Onthophagus anthracinus (Coleoptera: Scarabaeidae) species complex and the description of a new species, The Canadian Entomologist 152 (1), pp. 1-17 : 13-14

Key to the species in the Onthophagus anthracinus species complex

1. Pygidium apically convex, shiny, and smooth; distinctly punctate; alutaceus basally ( Fig. 7 ). Pronotal punctures with indistinct margin, ( Fig. 8 ) ........................................................................ 2

– Pygidium almost flat, shallowly and indistinctly punctate, alutaceous basally; apex less shiny and alutaceous ( Fig. 9 ). Pronotal punctures with distinct margins, often appearing like a shiny, ocellate ring, ( Fig. 10 ) ...................................................................................................... 3

2. Posterior half of metaventrite medially impunctate or with one or two course punctures ( Fig. 11 ). Usually occurs in lowland alluvial habitats from Texas, United States of America to Oaxaca, Mexico................................ Onthophagus alluvius Howden and Cartwright, 1963

– Posterior half of metaventrite medially with a few coarse punctures near midline, as coarsely punctate medially as laterally with larger punctures ( Fig. 12 ). Usually occurs in montaine habitats from Arizona, United States of America to Sierra Madre Occidental and the Transverse Volcanic System (Federal District, Mexico) ............................................................ ........................................................................................ Onthophagus durangoensis Balthasar, 1939

3. Pronotal punctures umbilicate ( Fig. 10 ); small, shallow, nonsetate secondary punctures abundantly scattered among large punctures. Big Bend region of Texas, United States of America to Veracruz, Mexico.................................................................................................................. .................................................................. Onthophagus mextexus Howden and Cartwright, 1970

– Pronotal punctures not umbilicate, like a shiny ring ( Fig. 13 ); small, shallow nonsetate secondary punctures sparsely scattered among large punctures. Oaxaca Highlands, Mexico to Chiriquí, Panama................................................................................................................................ 4

4. Pronotal punctures 75 μm in diameter with an evident shiny ring, punctures separated by approximately one puncture diameter ( Fig. 13 ). Pronotal longitudinal sulcus evident in major males ( Fig. 13 ), area around it convex. Phallobase with a distinct ring ( Fig. 19 ), internal sac lamella as in Figure 22 . Oaxaca, Mexico...................................................................... ........................................................................................................ Onthophagus etlaensis new species

– Pronotal punctures 50 μm in diameter with no evident shiny ring, separated by 1–2 puncture diameters ( Fig. 14 ). Pronotal midline well marked in major males ( Fig. 14 ), pronotal area around it flattened forming a rhombus. Phallobase with an indistinct ring ( Fig. 17 ), internal sac lamella as in Fig. 21 . Chiapas, Mexico to Chiriquí, Panama.................. .............................................................................................. Onthophagus anthracinus Harold, 1873

Figures

Figs 7–12. Species in the Onthophagus anthracinus species complex. 7, Pygidium of male Onthophagus alluvius; 8, pronotum of a male Onthophagus alluvius; 9, pygidium of male Onthophagus mextexus; 10, pronotum of a male of Onthophagus mextexus; 11, metasternal midline of a male Onthophagus alluvius; 12, metasternal midline of a male Onthophagus durangoensis.

Figs 13–15. Species in the Onthophagus anthracinus species complex. 13, Male pronotum of Onthophagus etlaensis; 14, male pronotum of Onthophagus anthracinus; 15, dorsal view of a male Onthophagus durangoensis.

Figs 16–20. Aedeagi of the Onthophagus anthracinus species complex. 16, Onthopagus alluvius; 17, O. anthracinus; 18, O. durangoensis; 19, O. etlaensis; 20, O. mextexus.

Figs 21–22. Lamella copulatrix and accesory lamellae. 21, Onthophagus anthracinus; 22, O. etlaensis.