Dihymenonyx Gutiérrez, 1949

Smith, Andrew B. T. & Evans, Arthur V., 2018, Taxonomic review of Athliini (Coleoptera: Scarabaeidae: Melolonthinae), a new tribe of scarab beetles endemic to South America, Zootaxa 4471 (2), pp. 279-308 : 295-296

Dihymenonyx Gutiérrez, 1949

Dihymenonyx Gutiérrez, 1949: 16 . Type species Dihymenonyx herrerai Gutiérrez, 1949 by original designation.

Redescription. Length 9.0–13.0 mm. Elongate-oval, widest about middle of elytra; reddish brown, brown, or dark brown; dorsal and ventral surfaces shiny, glabrous. Head: labrum wide, broadly emarginate and evenly reflexed anteriorly, and completely fused to clypeus with labroclypeal suture more-or-less distinct and terminating in small, marginal notches. Mentum longer than wide, narrowly emarginate in front, with sides broadly arcuate, gradually converging posteriorly. Antennae with 9 antennomeres, club with 3 short, thick lamellae. Pronotum: convex, wider than long, widest medially or slightly behind middle. Elytra: convex and coarsely punctostriate. Metathoracic wings fully developed or reduced in size. Abdomen: without lateral carinae on ventrites. Legs: protibia with three apical teeth on outer margin, basal tooth weak, spur present and shorter than first tarsomere. Claws symmetrical and bifid, each pair flanked on both sides at base by a membranous flap, and with a short, bisetose onychium in between. Metatibial apices with spurs set in notch, longest spur reaching about half the length of first tarsomere. Male genitalia: symmetrical parameres simple in form, not split or with strong sinuations, and somewhat subequal in length of phallobase.

Composition. All three species of Dihymenonyx are endemic to Chile ( Fig. 73 ).

Remarks. Dihymenonyx was revised by Mondaca (2007).

Figures

FIGURE 73. Distribution map of Dihymenonyx herrerai Gutiérrez, 1949 (black circle), Dihymenonyx micropterus Mondaca, 2007 (red circles), and Dihymenonyx suboblongus Mondaca, 2007 (green circle).