Acanthalictus Cockerell, 1924

Pesenko, Yuri A., 2007, Subgeneric classification of the Palaearctic bees of the genus Evylaeus Robertson (Hymenoptera: Halictidae), Zootaxa 1500 (1), pp. 1-54 : 7

11 (2). Both sexes: larger, body length 11.0–13.0 mm (sometimes males 7–10 mm long). Male: labrum along its entire height with very large median prominence; S 2 in front of posterior margin with large rounded transverse swelling. Female: mandible 3-dentate (with two subapical teeth) ........................ ................................................................................................................ 10. Acanthalictus Cockerell

– Both sexes: smaller, body length 4.0–9.0 mm. Male: labrum without median prominence; S2 flat. Female: mandible 2-dentate (with one subapical tooth)...................................................................12

12 (11). Both sexes: dorsal surface of propodeum convex, gradually curved onto both posterior vertical and lateral surfaces; rugulose or granulose sculpture of metapostnotum usually not reaching posterior margin of dorsal surface of propodeum; mesopleuron punctate ...................................................... 13

– Both sexes: dorsal surface of propodeum, flat, horizontal, forming a distinct right angle with its posterior vertical surface at least medially (this angle is sometimes rounded and feebly marked); metapostnotum usually distinctly marked at posterior margin by transverse carina, swelling, or abrupt change of sculpture, usually reaching posterior margin of dorsal surface of propodeum; sculpture of mesopleuron variable........................................................................................................................15