Allorrhina tridentata Moser, 1908

Ratcliffe, Brett C., 2015, A Revision of the Neotropical Genus Allorrhina Burmeister, 1842 (Coleoptera: Scarabaeidae: Cetoniinae: Gymnetini), The Coleopterists Bulletin 69 (1), pp. 91-113 : 91-113

Allorrhina tridentata Moser, 1908

( Figs. 39–41 )

Allorrhina tridentata Moser 1908: 86 (original combination).

Lectotype male at ZMHU, labeled: “ Rio Verde / Goyaz Brésil // Allorrhina tridentata Mos. /Type, male symbol// G. Ruter det. 1964/ Allorrhina tridentata Moser , Holotype, male symbol” and with my red lectotype label. Lectoallotype female at ZMHU with same labels except with female symbol and with my red lectoallotype label. Two paralectotypes at ZMHU with same locality data and with my yellow paralectotype labels. Lectotypes examined, designated by Ratcliffe (2004).

Description. Length 15.2–20.0 mm; width across humeri 9.1–12.0 mm. Dorsum dark green (head black in 1 specimen) to blackish green, or almost black with greenish reflection, lacking cretaceous marks; head and pygidium weakly shiny, pronotum and elytra opaque with shiny punctures. Venter and legs dark green or reddish brown with greenish reflections, shiny, lacking cretaceous marks. Setae of venter and legs cream-white in males, tawny in females. Head: Frons and clypeus of males weakly concave either side of center, with dense punctures moderate in size, setigerous; setae short to moderately long in pristine specimens, sparse, tawny. Each lateral margin broadly explanate; clypeal apex subtruncate with small, rounded to subquadrate, reflexed prominence at center. Males with occipital horn a low, longitudinal ridge with apex barely free. Frons and clypeus of females similar but usually lacking longitudinal tumescence at center. Interocular width equals 5.0–6.0 transverse eye diameters. Antenna with 10 antennomeres, club subequal in length to entire stem in males, slightly shorter in females. Pronotum: Surface opaque, with small, sparse, round, shiny punctures on disc, punctures becoming moderate in size to large, denser, ocellate, and crescent-shaped to transversely vermiform on sides and in angles. Lateral margins slightly emarginate between middle and basal angle, with complete, shiny marginal bead. Elytra: Surface opaque, with 2 slightly elevated, parallel costae on disc, costae terminating at apical umbone. Disc with 5 distinct, incomplete rows of punctures; punctures moderate size, horseshoe-shaped, ocellate, shiny. Apices at suture weakly, angularly produced. Pygidium: Surface densely, transversely rugulose, with minute, tawny setae in pristine specimens. In lateral view, surface nearly flat in males to weakly convex in females. Venter: Metasternum on lateral thirds with large, transverse, vermiform punctures, center third nearly impunctate. Mesometasternal process, in lateral view, short, parallel to ventral axis of body; in ventral view, sides parallel, apex broadly rounded. Abdominal ventrites 1–6 of males with a few, small punctures on lateral margins, females with punctures slightly denser on ventrites 5–6. Legs: Protibia in both sexes tridentate, basal tooth weakly to strongly removed. Parameres: In caudal view, form subrectangular, apices broadly rounded, a small tooth before apex ( Figs. 40–41 ). Basal piece subequal in length to parameres.

Distribution. Allorrhina tridentata occurs in south-central Brazil.

Locality Records. 53 specimens from BMNH, MNHN, RMNH, ZMHU, and ZSMC. BRAZIL (53). GOIÁS (48): Campinas, Jatahy (Jataí), Leopoldo de Bulhões, Mineiros, Rio Verde , No data. MATO GROSSO (4): Chapada dos Guimarães, Cuiabá. NO DATA (1).

Temporal Distribution. January (1), November (1). All the specimens studied are old and without dates of collection. Like other species of Allorrhina that occur in this same area, adult activity is primarily during November through January.

Diagnosis. Allorrhina tridentata is opaque and dark green to nearly black with greenish reflections on its pronotum and elytra and lacks any cretaceous marks. The club of the antenna is longer than in other species in the genus, and the basal piece of the genitalia is much shorter than in other species of the genus (subequal in length to the parameres) ( Fig. 41 ). In all other species, the basal piece is one and a half or twice as long as the parameres (e.g., Fig. 34 ). Males have only weak armature on the head.

Natural History. Nothing is known of the life history of A. tridentata .

Figures

Figs. 39–41. Allorrhina tridentata. 39) Habitus; 40–41) Parameres.

Figs. 32–34. Allorrhina scabriuscula. 32) Mesometasternal process; 33–34) Parameres.