Archophileurus chaconus ( Kolbe, 1910 )

Ratcliffe, Brett C., Cave, Ronald D. & Mondaca, José, 2021, The Dynastine Scarab Beetles (Coleoptera: Scarabaeidae: Dynastinae) of Chile, The Coleopterists Bulletin 75 (2), pp. 279-309 : 295-296

Archophileurus chaconus ( Kolbe, 1910) ( Figs. 30–33 )

Phileurus chaconus Kolbe 1910: 154 (original combination).

Redescription. Length 18.0–25.0 mm; width 8.5–11.5 mm. Color black, weakly shiny. Head: Surface of male majors ( Fig. 30 ) smooth or smooth with a transverse rugopunctate band between eyes; male minors rugose or rugopunctate (usually less so in central, longitudinal depression between tubercles); females usually entirely rugose. Frons with 2 stout, vertical horns in majors; horns subequal in length to width between eyes, slightly recurved, apices bluntly rounded; male minors and females ( Fig. 31 ) with stout tubercle instead of horns. Clypeus triangular, apex acute, reflexed; slender carina extends from clypeal apex to base of each horn/tubercle. Interocular width equals about 5.0 transverse eye diameters. Antennal club slightly longer than antennomeres 2–7. Pronotum: Males with small, moderately dense punctures everywhere except in longitudinal furrow, anterior margin, and anterior angles where punctures moderate in size and density; females similar except punctures larger, denser. Median, longitudinal furrow deep, narrow, extending from apex to base and expanded into large, round fovea on anterior half in majors. Base with complete marginal bead. Elytra: Surface with deeply furrowed, uniserially punctate striae; each puncture moderately large to large, ocellate, separated by about 1 puncture diameter or less between punctures. Intervals convex, all subequal in height. Pygidium: Surface moderately densely punctate; punctures moderate and large mixed, deep. Surface of male strongly convex in lateral view; female strongly, transversely protuberant on middle of disc. Legs: Protibia tridentate, teeth long, slender, equally spaced. Venter: Prosternal process very short, subtriangular, laminate. Parameres: As in Fig. 32 .

Distribution. Archophileurus chaconus occurs in southern South America ( Brazil, Argentina, Uruguay, Paraguay, Bolivia, and Chile) ( Endrödi 1977a). The no-data records for French Guiana and Ecuador in Endrödi (1977a) cannot be verified and seem unlikely to us.

Locality Records ( Fig. 33 ). 10 specimens from IEUMCE, JMEC, MNNC, SRTC, and Endrödi (1977a) .

REGIÓN DE ANTOFAGASTA (5): ANTOFAGASTA (5): Antofagasta, Puerto de Antofagasta.REGIÓN DEARICA Y PARINACOTA (1): ARICA (1): San Miguel de Azapa . REGIÓN DE TARAPACÁ (4): IQUIQUE (3): Iquique; TAMARUGAL (1): Camiña .

Temporal Distribution. January (2), July (1), October (2), November (1), December (3).

Diagnosis. Archophileurus chaconus is recognized by the tribal characteristics for Phileurini , the fringe of reddish brown setae on the lateral margins of the pronotum, and the distinct form of the parameres ( Fig. 32 ).

Natural History. Nothing is known of the life history for A. chaconus . In Antofagasta, adults come to the lights in urban parks located in the city. This species is probably not native to Chile but may occur as an ancient introduction to the country, possibly from Bolivia, since the natural populations of this species are located east of the Andes.

Figures

Figs. 30–33. Archophileurus chaconus. 30) Male; 31) Female; 32) Parameres; 33) Distribution.