Macrodactylus eniocanoi Arce-Pérez & Morón, 2020

Arce-Pérez, Roberto & Morón, Miguel Ángel, 2020, Review of the species of Macrodactylus Dejean (Coleoptera: Scarabaeidae Melolonthinae) from the Central American Nucleus, Zootaxa 4772 (3), pp. 567-584 : 569

Macrodactylus eniocanoi Arce-Pérez & Morón , new species

Figs. 1, 3, 5–8, 84

Material examined (12 specimens 9 ♂, 3♀): Holotype male label: Guatemala: Zacapa, San Lorenzo, Sierra de las Minas , 9.v.1993, E. Valdez [ UVGC] . Paratypes (12): Guatemala: Zacapa, San Lorenzo , cerro de los monos, 2190 m, 14.iv.1994, (2♂, 1♀) [ UVGC], (1♂, 1♀) [ IEXA] ; Zacapa, Sierra de las Minas, 5 km NE from San Lorenzo , 2100 m, 7.vi.1993, (5♂, 1♀) [ PKLC] ; Zacapa, Sierra de las Minas, 5 km NE from San Lorenzo , 2100 m, 17.vi.1993, J.M. Campbell (1♀) [ CMNC] .

Diagnosis. Integument of the body glossy black with yellow-green iridescence; elytra and legs reddish yellow; pronotum, elytra, and pygidium covered with pale yellow setae; venter with vestiture long and dense (Figs. 1, 3); profemur with a subtriangular projection near the base, elongate and twisted near the acute apex, followed by an obvious depression; tarsi with rings of long, white setae. Female pronotum wider than long, the posterior angles acute and extended laterally, and with poorly defined glabrous midline.

Description. Holotype Male: length 9.5 mm; humeral width 3 mm. Color: integument of the body black glossy with yellow-green iridescence; antennae bicolored; clypeus, elytra, and legs reddish yellow (apex of tibiae and tarsi darker); head, pronotum, scutellum, and pygidium black with yellow-green iridescence. Surface: pronotum, elytra, and pygidium covered by pale yellow vestiture; venter with vestiture long and dense (Figs. 1, 3). Head: elongate, with a longitudinal ridge and a lateral depression, coarsely punctate; clypeus trapezoidal, anterior border nearly straight. Thorax: pronotum hexagonal, convex, length 2.65 mm, width 2.60; prosternal process long, slender, subtriangular, curved, apex acute (easily to see in frontal view); scutellum elongate with rounded apex. Elytra reddish yellow, vestiture pale yellow. Metasternum with two longitudinal rows of long, yellow setae between mesocoxae and metacoxae. Legs: Profemur short, with a subtriangular projection near to the base, elongate and twisted near the apex, followed by an obvious depression. Mesotibia widened towards apex with two short, straight spurs and long spine-like setae around the apex. Tarsi with rings of long, white setae; all tarsal claws cleft. Abdomen: Sternites II–V moderately concave at middle, with five to six long yellow setae on each side of midline; pygidial plate elongate, oval with vestiture equal to the ventral. Genitalia: total length 2.38 mm (Fig. 7); parameres short, oval, glabrous, fused dorsobasally, with a distinct dorsobasal internal emargination; widest mid-basally, distal half bent medially, apices rounded, forming an oval in distal view, length of parameres 0.80 mm, width across fused structure 0.70 mm (Figs. 5–6).

Allotype Female: length 10 mm; humeral width 3.5 mm. Similar to male except: vestiture is longer and erect; pronotal length 2.25 mm, width 2.50 mm, with poorly defined, glabrous midline (longitudinal stripe) and the posterior angles acute and extended laterally; abdominal sternites II–IV convex; pygidium short and nearly triangular. Genital plates short oval, length 0.82 mm, width 0.28 mm, apex asymmetrical, and external border nearly straight (Fig. 8).

Variation. Body length 9.5–10.0 mm; width across humeri 3.0–3.5 mm, apex of the tarsi and tibiae in some specimens are paler.

Geographical distribution. Known only from eastern Guatemala (Fig. 84).

Natural history. Three males and two females were collected as pupae in mountain forest at an elevation of 2,100 m on 10 April 1994, and the adults emerged in May and June.

Etymology. Dedicated to Enio Cano, enthusiastic scarabaeidologist, who provided the original material for the description.

Taxonomic comments. Macrodactylus eniocanoi is placed in a new species group (that will be described later) characterized by an acute triangular projection of the profemora and falcate parameres.