Page:Memoirs on the coleoptera (IA memoirsoncoleopt01case).pdf/15

Rh

Distinguishable from affluens principally by the notably different sexual modification fo the sixth tergite of the male. Superficially, the species of this section of Atheta resemble each other very closely throughout.

Seperable from any of the preceding by its rather smaller head and prothorax and small size of the body, as well as by differences in the male sexual characters.

The slender form and broad, feebly defined lobe of the sixth male tergite will probably prove efficient determinative characters for this species.