Key to the genera of Dryininae from the Neotropical region

1. Antenna entirely filiform; 1st and 2nd flagellomeres distinctly elongated, about subequal in length; number of maxillary and labial palpomeres variable .............................................................................................................................................................................2

– Antenna with apical flagellomeres distinctly thicker than basal flagellomeres; 1st flagellomere longer than 2nd; maxillary and labial palpi with 6 and 3 palpomeres, respectively...........................................................................................................................3

2. Maxillary and labial palpi with four and two palpomeres, respectively; occipital carina incomplete; pronotal lobe not reaching tegula; notauli incomplete and not converging posteriorly; protrochanter straight; enlarged claw without subapical teeth.................................................................................................................................................................................... Gonadryinus Olmi

– Maxillary and labial palpi with six and three palpomeres, respectively; occipital carina complete; pronotal lobe reaching tegula; notauli complete and converging posteriorly; protrochanter elongated and strongly curved; enlarged claw with one or two subapical teeth........................................................................................................................................† Harpactosphecion Haupt

3. Antenna with one set of rhinaria on each flagellomere; pronotal lobe not reaching tegula; middle and posterior claws distinctly curved inward, basal expansion well developed and lacking long setae...................................................... Dryinus Latreille

– Antenna with two sets of rhinaria on each flagellomere; pronotal lobe reaching tegula; middle and posterior claws gently curved, basal portion not distinctly expanded and possessing a long seta ........... Dirrhinodryinus Martins and Melo gen. nov.