Macrodactylus

Smith, Andrew B. T., 2008, South American Melolonthinae (Coleoptera: Scarabaeidae) classification and nomenclature: some problems and solutions, Insecta Mundi 2008 (60), pp. 1-28 : 10-11

Key to Chilean species of Macrodactylus

Males have no metatibial spurs, a flat or concave abdomen, scales covering the body, and are generally light in color. Females have two metatibial spurs, a convex abdomen, no scales, and are dark to black in color. 1. Males (Fig. 8) with long, erect setae interspersed with scales on disc of pronotum and abdomen (in two distinct longitudinal lines), dorsal and ventral surface flattened in lateral view. Females (Fig. 9) bicolored with chestnut brown elytra and dark brown body, body covered with light colored setae ......................................................................... Macrodactylus chilensis Solier

— Males (Fig. 10) with long, erect setae along margins of pronotum but generally not on the disc; abdomen with a central patch of erect setae organized more latitudinally, dorsal and ventral surface distinctly convex in lateral view. Females (Fig. 11) black with dark setae covering body ........................................................................................ Macrodactylus farinosus Philippi