Macrodactylini (Katovich, 2008)

Smith, Andrew B. T., 2008, South American Melolonthinae (Coleoptera: Scarabaeidae) classification and nomenclature: some problems and solutions, Insecta Mundi 2008 (60), pp. 1-28 : 8-9

Key to the Macrodactylini genera from southern South America

1. Total length greater than 15 mm ................................................................................................ 2

— Total length less than 12 mm ..................................................................................................... 3

2(1). Mesosternal peg evident between mesocoxae; pronotum and head metallic green or brown with green reflections .......................................................................... Pseudodicrania Gutiérrez

— Mesosternal peg absent; pronotum and head brown to black, without green reflections .............. ................................................................................................................ Issacaris Fairmaire

3(2). Protibia along outside edge smooth with 1-2 large teeth near apex; protibial spur absent ........ 4

— Protibia along outside edge saw-toothed with 2 larger teeth near apex; protibial spur present or absent ................................................................................................... Pristerophora Harold

4(3). Pygidium wider than long, convex; sexual dimorphism not extreme: males and females with similar setal patterns, not covered with scale-like setae ......................................................... 5

— Pygidium longer than wide, greatly convex; sexual dimorphism extreme: males covered with scale-like setae, abdomen flattened ventrally; females covered with fine setae, abdomen bulbous ventrally ............................................................................................. Macrodactylus Dejean

5(4). Dorsal surface bicolored with dark areas on pronotum and dark areas or spots on apex and base of elytra (sometimes these dark areas are expanded and can cover almost the entire elytra); dorsal surface with setae evenly distributed ........................................... Pusiodactylus new genus

— Dorsal surface not bicolored (or weakly bicolored); dorsal surface with obvious setal patterns, setae not evenly distributed ........................................................ Ampliodactylus new genus