Macrodactylus sericinus Bates, 1887

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 : 579-580

Macrodactylus sericinus Bates, 1887

Figs. 51, 66–68, 85

Material examined. 6 specimens: 4 ♂, 2 ♀.

Diagnosis. This species is distinguished by the following combination of characters: body length 9.5–10.5 mm; integument black, strongly sericeous; pronotum black with a narrow band of yellow setae in apical half, and sparse setae near edges of disc; elytra glabrous, strongly sericeous, basal half reddish brown and apical half black or dark brown; palpi, antennae, legs reddish yellow, tibiae, and tarsi black, tarsi without rings of setae (Fig. 51); parameres oval, glabrous, fused dorsobasally, outer margins rounded, apical half long and slender with apices lanceolate (Figs. 66–67); Female with vestiture and color similar to male; genital plates (Fig. 68).

Natural history. Adults are active in hot-humid environments between 300 and 1,500 m (additional information in Arce-Pérez & Morón 2005, 2011, 2018).

Geographical distribution. Nicaragua (Costa Caribe Norte, Granada, Managua) and Costa Rica (Fig. 85).

Figure 86. Distribution of Macrodactylus in the Central American Nucleus: M. dimidiatus (yellow circle), M. montanus (blue circle), M. suavis (green circle).