Key to the Subfamilies and Genera of the Naucoridae of Mexico

(modified from Usinger 1941, Polhemus 2008, Mbogho & Sites 2013)

1. Front of head folded posteroventrally...................................... ( Laccocorinae).... Interocoris La Rivers

1'. Front of head not folded posteroventrally.................................................................. 2

2. Anterior margin of pronotum straight or slightly concave behind interocular space.................................. 3

2'. Anterior margin of pronotum deeply emarginate behind interocular space (e.g., Fig. 3 A)............. ( Cryphocricinae)...4

3. Inner margins of eyes diverging anteriorly; meso- and metasterna with prominent longitudinal carinae............................................................................................ ( Limnocorinae)..... Limnocoris Stål

3'. Inner margins of eyes converging anteriorly; meso- and metasterna without prominent longitudinal carinae............................................................................................ ( Naucorinae).... Pelocoris Stål

4. Propleura extending mesad to cover posterior portion of prosternum (prosternellum) and contiguous or nearly so at midline (Figs. 1 A, B); abdominal sternum densely pubescent; fore wing macropterous form................................ 5

4'. Prosternum exposed, without mesal extensions of propleura; abdominal sternum glabrous; fore wing brachypterous and macropterous forms................................................................... Cryphocricos Signoret

5. Body surface covered with scattered granules; eyes distinctly elevated and subglobose; abdominal sternum with wide, lateral glabrous band; meso- and metapretarsal claws large and strongly curved over entire length nearly to semicircle.............................................................................................. Cataractocoris Usinger

5'. Body surface without granules; eyes scarcely elevated above surface of head; abdominal sternum almost entirely pubescent, lateral glabrous band narrow; meso- and metapretarsal claws small with curvature mostly in distal half and never to semicircle.......................................................................................... Ambrysus Stål