Couplet 142

142a:  Antenna serrate or pectinate; antennal insertion exposed from above; hind coxa laterally reaching epipleuron; intercoxal process of prosternum with long, notched, apical projection, received in deep mesosternal cavity to form clicking mechanism; last ventrite without submarginal groove; mentum without setose pit

Cerophytidae   p. 421

142b:  Antenna moniliform, clavate, or capitate; antennal insertion concealed from above; hind coxa not reaching elytron, first ventrite and metepimeron in contact laterad of coxa and mesad of epipleuron; prosternal process broad, widened apically; last ventrite usually with submarginal groove; males often with median setose pit on mentum