Couplet 154

154a:  Intercoxal process of first ventrite absent, no part of ventrite extending between coxae to contact metasternite; first ventrite lacking margined hind coxal cavities; hind coxa conical and projecting; body soft; small, triangular part of true abdominal sternite 2 usually visible laterad of hind coxa (that is, ventrite 1 small, divided); often colorful, with red, yellow or metallic blue or green markings; length 5-12 mm (Psoinae)

Bostrichidae   p. 426

154b:  Intercoxal process of first ventrite complete; first ventrite with margined coxal cavities; hind coxa transverse; body fully sclerotized, ventrite 1 closing anterolateral angle between hind coxa and abdomen; never metallic; length 0.5-6.5 mm