Macrodactylus bolivianus Moser, 1918

Arce-Pérez, Roberto & Morón, Miguel Ángel, 2014, New species and records of Macrodactylus Dejean (Coleoptera: Scarabaeidae: Melolonthinae: Macrodactylini) from Bolivia, Zootaxa 3857 (2), pp. 292-300 : 296-298

Macrodactylus bolivianus Moser, 1918

( Figs. 18–19 , 22–25 )

Diagnosis. Body integument reddish black; clypeus red, frons black, pronotum, scutellum and pygidium dark red; antennae, elytra, and legs reddish yellow. Dorsally with vestiture of short, scale-like, white, individual setae that do not obscure the integument; tarsi with rings of white setae; parameres glabrous.

Redescription. Male: Body length 6.9 mm; humeral width 2.35 mm. Color: Body intensely reddish black; clypeus intensely red, frons black, pronotum, scutellum, pygidium mahogany red; antennae, elytra, legs reddish yellow. Surface: Clypeus and frons rugopunctate, pronotum punctate, elytra with 5 lightly impressed striae. Head: Form elongate. Clypeus trapezoidal, anterior border nearly straight. Antennal club as long as preceding 5 antennomeres. Maxillary palpi yellow, apical palpomere long and dark red. Labial palpi short and yellow. Mentum yellow, elongate, oval; longitudinally with wide furrow; sparse setae on surface. Thorax: Pronotum hexagonal, convex, wider than long (2.00: 1.75 mm) with longitudinal glabrous line. Prosternal process short, robust, slightly curved and rounded apically. Scutellum subtriangular; with wide, broadly rounded apex. Elytra with 5 weakly impressed striae, with short vestiture that do not obscure the surface. Metasternum wide, black; with weak rows of stout setae between mesocoxae and metacoxae, partially hidden between other slender setae. Abdomen: Sternites 2–5 concave and moderately flat at middle with 1–3 stout, yellow, long setae at each side of midline; length of sternite 5 twice length of sternite 4; sternite 6 ovate, with stout, long apical setae. Pygidium elongate, ovate; with short spine-like, apical setae. Legs: Profemur with a subrectangular projection near base. Mesotibia widened toward apex; with 2 straight, acute spurs and long spine-like setae around apex. Tarsi enlarged, with separated rings of white setae and long spine-like setae around apex. All tarsal claws long and cleft. Genitalia: Total length 2.10 mm. Parameres long and slender, oval, glabrous; narrow and fused dorsobasally; enlarged toward apex; flattened laterally; apex sharply pointed; with length 0.84 mm, width 0.50 mm ( Figs. 22–24 ).

Female: Body length 6.5 mm; humeral width 2.50 mm. Similar to males except as follows: pronotum length 1.85 mm, width 2 mm; sternites convex at middle with 3–5 medium setae at each side of midline. Pygidium short, subtriangular. Genital plates long, oval; with truncate, straight apex; length 0.84 mm, width 0.32 mm ( Fig. 25 ).

Material examined: BOLIVIA, Santa Cruz, 26.4 km NW Comarapa, Kara Huasi, Yungas de la Siberia, 17º49'32''S; 64º41'17''W, 28-I-1999, 2600 m, Yungas ex. hand collecting, 99-004, F. Génier (1 male, 1 female CMNC).

Natural history. Two specimens were collected in January during daylight hours on plants of wet elfin forest of Yungas de la Siberia, at 2600 m.

Remarks. The dark, shiny metallic pronotum and the shapes of the male and female genitalia aid in the recognition of this species.

Figures

FIGURES 18 – 21. Macrodactylus bolivianus: 18) dorsal view, 20) lateral view. Macrodactylus gracilis: 19) dorsal view, 21) lateral view.

FIGURES 22 – 29. Diagnostic structures of Macrodactylus bolivianus: 22) parameres, distal view, 23) parameres, lateral view, 24) basal piece, dorsal view, 25) female genital plates, ventral view. Macrodactylus gracilis: 26) parameres, distal view, 27) parameres, lateral view, 28) basal piece, dorsal view, 29) female genital plates, ventral view. Scales in mm.