Crassevylaeus, Pesenko, 2007

Pesenko, Yuri A., 2007, Subgeneric classification of the Palaearctic bees of the genus Evylaeus Robertson (Hymenoptera: Halictidae), Zootaxa 1500 (1), pp. 1-54 : 8

16 (15). Both sexes: body very robust; mesoscutum very coarsely and densely punctate, matt; mesopleuron very coarsely and densely (rasplike) alveolate. Male: hind tarsus short, 2nd tarsomere as long as distal width.....................................................................................................15. Crassevylaeus subg. n.

– Both sexes: body usually, more or less slender; sculpture of mesosoma finer; if mesoscutum and mesopleuron coarsely punctate (subgenera Puncthalictus and Rostrohalictus ), then interspaces shiny. Male: hind tarsus not unusually short, 2nd tarsomere longer than wide ............................... 17

17 (16). Both sexes: face, mesoscutum and mesopleuron (in subgenus Laevinodilaeus , only in males) coarsely punctate, interspaces shiny. Male: clypeus entirely black (except in E. angustipes and E. laevinodis ) ................................................................................................................................... 18

– Both sexes: face and mesoscutum significantly more finely punctate, usually partly or completely dull; mesopleuron granulate, rugulose, or finely punctate. [If these body surfaces relatively coarsely punctate and shiny on interspaces, then genal area of female coarsely and densely striate (subgenus Truncevylaeus ) or head very narrow and clypeus of female with striae (subgenus Rostrohalictus and many species of subgenus Puncthalictus )]. Male: clypeus usually yellow on lower third or fourth ..............................................................................................................................................................19