Anthophagini, Thomson, 1859

Shavrin, Alexey V., 2024, Review of Hygrogeus Mulsant & Rey, 1880 and Trichodromeus Luze, 1903, with descriptions of three new genera from the eastern Palaearctic Region (Coleoptera: Staphylinidae: Anthophagini: Omaliinae), Zootaxa 5531 (1), pp. 1-62 : 59

Key to genera of Anthophagini of the “ Hygrogeus ” complex

1 Penultimate segment of maxillary palpi twice or more longer than last segment.................................... 2

- Penultimate segment of maxillary palpi significantly shorter................................................... 3

2 Head very large and sometimes broader than pronotum. Pronotum narrow, slightly broadened in about middle or apical part............................................................................................ Philydrodes

- Head smaller, not broader than pronotum. Pronotum significantly broadened in apical part................ Hygrodromicus

3 Last segment of maxillary palpi narrow, more than twice to three times narrower than penultimate segment.............. 4

- Last segment of maxillary palpi broader, distinctly less than twice or slightly narrower than penultimate segment......... 5

4 Antennomeres 4–10 shortened or elongate. Temples longer than longitudinal length of eyes. Aedeagus in usual position (180°) inside abdomen, with narrow median lobe and simplified structure of internal sac........................... Microedus

- Antennomeres 4–10 shortened. Temples shorter than longitudinal length of eyes. Aedeagus 90° rotated inside abdomen in lateral position, with broadened median lobe and complicated structure of internal sac......... Microhygrodromicus gen. n.

5 Maxillary palpi strongly elongate, with last maxillary palpomere distinctly longer than penultimate segment. Parameres strongly reduced........................................................................... Himalodromeus gen. n.

- Maxillary palpi moderately short, with last maxillary palpomere shorter than penultimate segment. Parameres long....... 6

6 Antennomeres 4–10 shortened............................................................. Paratrichodromeus

- Antennomeres 4–10 elongate............................................................................ 7

7 Antennomeres 4–10 broadened, subrectangular, each indistinctly broadened apically, about twice as long as broad. Parameres bilobed in apical portion........................................................................ Hygrogeus

- Antennomeres 4–10 narrow, each distinctly broadened apically, twice to four times as long as broad. Parameres not bilobed.. ................................................................................................... 8

8 Last maxillary palpomere with subacute apex. Pronotum cordiform, widest usually in middle portion......... Geodromicus

- Last maxillary palpomere with truncate or rounded apex. Pronotum distinctly transverse, subtrapezoidal, widest in anterior portion.............................................................................................. 9

9 Last maxillary palpomere strongly shorter than penultimate segment. Frontal part of pronotum significantly broadened, with not protruded medioapical portion..................................................... Asiageodromicus gen. n.

- Last maxillary palpomere slightly shorter than penultimate segment. Frontal part of pronotum narrower, sometimes with protruded medioapical portion................................................................ Trichodromeus