Couplet 155

155a:  Body elongate-oval and somewhat cylindrical; pronotum usually very convex in transverse section, edges often directed ventrally; pronotum without basal pits or impressions; head or pronotum of male often with horns or tubercles; antenna with 8-10 antennomeres and club of 2-3 antennomeres; males often with pubescent median fovea on first ventrite; head without distinct temples or neck

Ciidae   p. 434  (see footnote on p.395)

155b:  Body oval to elongate-oval, usually somewhat dorsoventally depressed; pronotum usually weakly convex transversely, edges directed laterally; pronotum with 2 basal pits or impressions laterad of scutellum, sometimes in posterior marginal groove and difficult to discern; head and pronotum without horns or tubercles; antenna with 11 antennomeres, last 2-5 forming club; all ventrites free, without median fovea

Mycetophagidae  p. 434  (See footnote on p.395)