Couplet 37
37a: Antenna separated from eye by distance at least equal to width of first antennomere, positioned laterally on long quadrate rostrum (Figure 26-85H) or very close to eye at base of short, robust rostrum; fore tibia with anterior face apically flat, simple, not distinct from rest of surface; hind femur with dorsal margins slightly to moderately arched; pygidium oblique to vertical; elytron often with a scutellary striole; body surface often with distinct metallic sheen. Attelabidae p.451
37b: Antenna situated immediately in front of eye at base of long, cylindrical rostrum; fore tibia with front face with shallow, grooved apical area filled with short, fine pilosity; hind femur with dorsal margin markedly arched, paddle-like shape, femur almost as wide as long; pygidium nearly horizontal; elytron lacking scutellary striole; body surface lacking metallic sheen. Belidae p.451
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