Key to species of Tylodinus spiniventris species group

1 Males with receptacle for apex of rostrum on mesosternum with a cup-shaped impression, surface of the impression finely granulose, females with a thorn-shaped median projection on abdominal ventrite 5 (Figures 20–21, 62–63).............................................................................................. T. spiniventris Luna-Cozar

- Males with receptacle without impression for apex of rostrum on mesosternum, females without abdominal projection (Figures 60–61)................................................................................ T. lum Luna-Cozar