Macrodactylus carrilloi Arce-Pérez & Morón, 2000

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 : 572

Macrodactylus carrilloi Arce-Pérez & Morón, 2000

Figs. 12, 21–23, 85

Material examined. 90 specimens: 53 ♂, 37 ♀.

Diagnosis. Length 11.0–13.5 mm, dorsally glabrous; elytra with interstriae elevated; integument shiny black; antennal flagellum, elytra, anal plate, pygidium, and legs (except tarsi) reddish orange; head, antennal club, pronotum, and tarsi black with steel blue iridescence; tarsi with rings of long, white setae (Fig. 12); parameres large, circular, with outer margins slightly rounded and with a protuberance near the base (lateral view), and their apices acute and lanceolate, with rows of long and abundant setae laterally in distal half (Figs. 21–22). Female similar to male except as follows: pronotum with abundant, long, recumbent vestiture, appearing velvety reddish brown; pygidial plate domed, slightly prominent; genital plates (Fig. 23).

Variation. Some females lack pronotal vestiture and the pronotum may be slightly wider than long.

Natural history. This species inhabits humid montane forests at elevations between 1,500 and 2,500 m (additional information in Arce-Pérez & Morón 2000, 2011).

Geographical distribution. Mexico (Chiapas) and Guatemala (Baja Verapaz, Cuyotenango, San Marcos, Zacapa) (Fig. 85) .