Acantholeria Garrett 1921

Key to the Palaearctic species of Acantholeria (only males, modified from Gorodkov, 1966) 1. Hind tibia (only male) with slender ventral projections or a swelling (in some species, posterior view more easily observed, such as Fig. 7)....................................................................................... 2 - Hind tibia (only male) normal, without projections or swelling (Fig. 25)......................................... 9 2. Hind tibia (only male) with slender twig-like ventral projections............................................... 3 - Hind tibia (only male) with a ventral swelling.............................................................. 6 3. Cerci (only male) strongly curved, hook-shaped, forming an arc of more than 90°............. A. czernyi Gorodkov, 1966 - Cerci (only male) weakly curved, almost straight............................................................ 4 4. Editum well developed, with prominent edges and other complex structures.............. A. stackelbergi Gorodkov, 1966 - Editum simple and short (A. dentitibia Oldenberg, 1916 s. l)................................................... 5 5. Hind tibia (only male) process slender; cerci long and straight, surstyli narrow and pointed............................................................................................... A. dentitibia dentitibia Oldenberg, 1916 - Hind tibia (only male) process stout; cerci short and curved, surstyli wide and truncate..... A. d. asiatica Gorodkov, 1966 6. Hind tibia with a ventral swelling near base......................................... A. monstrosa Gorodkov, 1966 - Hind tibia with a ventral swelling at middle................................................................ 7 7. Cerci with bifurcation; hind tibia with a poorly developed ventral swelling (Figs. 6–7).............................. 8 - Cerci without bifurcation; hind tibia with a distinct ventral swelling........................... A. armipes Loew, 1861 8. Cerci with bifurcation at tip; crossveins without infuscations.............................. A. moscowa Garrett, 1925 - Cerci with bifurcation near base (Figs. 8, 10); crossveins infuscated (Fig. 5)...................... A. gorodkovi sp. nov. 9. Hind femur with a group of spine-like setae in a close arrangement at base, and without spine-like subapical setae...................................................................................... A. desertorum Czerny, 1932 - Hind femur with spine-like subapical setae................................................................ 10 10. Hind femur with 2–3 spine-like subapical setae; cerci strongly curved, forming an arc about 180°.................................................................................................. A. caucasica Gorodkov, 1962 - Hind femur with one row of 7–12 spine-like subapical setae; cerci curved weakly............... A. cineraria Loew, 1862