Key to females of Japanese Embolemidae (modified from Olmi et al. 2014a)

1. Macropterous.......................................................................... Ampulicomorpha: 2

- Micropterous......................................................................................... 3

2. Metapostnotum with three longitudinal keels............................................... A. viator Mita & Olmi

- Metapostnotum with two longitudinal keels........................................ A. thauma Rasnitsyn & Matveev

3. Head fusiform (Figs 7, 9); eye strongly reduced (Fig. 6); mesoscutellum narrow, alutaceous, trapezoidal, with shorter base posterior (Fig. 9); metanotum reduced to narrow longitudinal carina forming a bridge upon the first region of metapostnotum (Fig. 9)................................................................................... Trogloembolemus: 4

- Head not fusiform (Fig. 10); eye normal size; mesoscutellum subcircular (Fig. 10); metanotum short and transverse................................................................................................. Embolemus: 5

4. Mesoscutum ovoidal, as long as wide; metapostnotum not rugose.................... T. fujiei Olmi, Mita & Guglielmino

- Mesoscutum transverse, wider than long; metapostnotum rugose................................... T. okanoi sp. nov.

5. Anterior surface of metapostnotum shiny, weakly granulated, not rugose.............................................................................................................. E. honshuensis Olmi, Mita & Guglielmino

- Anterior surface of metapostnotum dull, rugose.............................................................. 6

6. Metapostnotum with median depression situated at border between anterior and posterior surface............................................................................................................ E. walkeri Richards

- Metapostnotum without such depression..................................................... E. krombeini Olmi