Couplet 158

158a:  First ventrite much longer than second, measured behind coxa; elytra without punctate or impressed striae (traces of striae occasionally visible through cuticle but not expressed on the surface); epipleuron distinct in basal half, not reaching apex, usually narrowed at level of third ventrite; gena carinate and projecting ventrally between eye andmentum; apex of elytra with double suture or “subapical gap” caused by wide flange of elytral coupling system; elytra complete, exposing atmost tip of last tergite

Cryptophagidae   p. 431   (See footnote on p.396)

158b:  Not fitting this combination of characters, either with the first ventrite short, elytra striate, epipleuron complete to apex, gena flat between eye and mentum, or elytra not covering most of pygidium