Pseudoanthidium tenellum (Mocsáry, 1881)

Byvaltsev, A. M., Belova, K. A., Danilov, Yu. N., Molodtsov, V. V. & Proshchalykin, M. Yu., 2018, Megachilid bees (Hymenoptera: Megachilidae) of the forest-steppe and steppe zones of the West Siberian Plain to the eastward of Irtysh River, Far Eastern Entomologist 364, pp. 10-28 : 15

Pseudoanthidium tenellum (Mocsáry, 1881)

SPECIMENS EXAMINED. Russia. Novosibirsk Prov.: Evsino , 6. VII 2017, 1 ♂, KB .

DISTRIBUTION IN WEST SIBERIA. *No. This is a first record from the territory to the eastward of the Urals.

REMARK. Pseudoanthidium tenellum is a member of the “ lituratum ” species complex.

The reliable characters for delimitation of this species from others were given in Aguib et al.

(2010), but we have been unable to use them for females, because of their complexity and the lack of material for comparison. Our female specimens could be P. tenellum , P. nanum

(Mocsáry, 1881) or one of three species described from the Urals which have not been revised properly: P. floripetum (Eversmann, 1852) , P. reptans (Eversmann, 1852) , and P.

eversmanni (Radoszkowski, 1886) (see Proshchalykin et al., 2017). Thus females are not listed here.