Couplet 180

180a:  Head prognathous, not abruptly constricted to a narrow neck, lacking distinct temples (Figure 26-66A); anterior portion of prosternum as long or longer than prosternal process

Oedemeridae   p. 438

180b:  Head distinctly declined, abruptly constricted to form narrow neck behind distinct temples; anterior portion of prosternum shorter than prosternal process (Eurygeniinae)