1      Temples (area behind the eyes) very long, at
       least 1,5 times as long as the eye diameter
       ................................ Apion frumentarium
1´     Temples shorter, thus eyes closer to the
       anterior rim of the pronotum..................... 2

2      Posterior portion of the temples is not
       punctate and looks shiny......................... 3
2´     Entire temple area punctate....... Apion cruentatum


3      Entire animal regular oval, with almost straight
       sides of the elytra and the pronotum clearly
       shorter than wide..................... Apion rubens
3´     Entire animal pear-shaped, sides of the elytra
       clearly rounded and the pronotum is not much
       shorter than wide or even longer than wide....... 4


4      Upper side of the proboscis viewed from the side
       is straight...................... Apion rubiginosum
4´     Upper side of the proboscis viewed from the side
       is visibly curved................. Apion haematodes