Identification key for species of Chartergus Lepeletier (adapted from Richards 1978)

1. Central tubercle of metanotum very weak, often hardly noticeable (Fig. 2B, E); pronotum black, without anterior color band (Fig. 2A, B, E, F), prominence near ventral corner shorter and less acute but often more raised; metanotum with a pale band across the top half, rarely partly black.......................................... C. globiventris de Saussure, 1854

1’. Central tubercle of metanotum stronger (Fig. 1B, 3B); pronotum with anterior yellow band (Fig. 1 A, B, 3 E, F); metanotum nearly always entirely black or as above................................................................... 2

2. Metanotum nearly always entirely black or with small yellow spots on the sides; pronotum with anterior whitish yellow band, usually incomplete and stronger in the middle (Fig. 3 E, F); scrobal furrow with more or less regular cross-keels.................................................................................... C. metanotalis Richards, 1978

2. Metanotum with a pale band across the top half, rarely partly black here; pronotum with a complete anterior pale band (Fig. 1 A, B); scrobal furrow with less regular and usually weaker cross-keels........................ C. artifex (Christ, 1791)