An illustrated type catalogue of the bee species collected by Alfred Russel Wallace and described by Frederick Smith from Southeast Asia (Hymenoptera: Apoidea)

Lectotype designations are formally published for 13 species, as well as for two additional species described by Heinrich Friese. New synonymies are formally made: Megachile clotho Smith, 1860 is synonymised with Megachile tuberculata Smith, 1857 syn. nov.; Megachile placida Smith, 1862 is synoymised with Megachile foliata Smith, 1860 syn. nov.; Megachile albocaudata Friese, 1903 is synonymised with Megachile terminalis Smith, 1858 syn. nov.; Xylocopa insularis Smith, 1857 and Xylocopa bangkaensis Friese, 1903 are synonymised with Xylocopa caerulea (Fabricius, 1804) syn. nov.; and Xylocopa dormeyeri Enderlein, 1909, Xylocopa caeruleiformis Meade-Waldo, 1914, and Xylocopa caeruleiformis var. fusca Meade-Waldo, 1916 are synonymised with Xylocopa tumida Friese, 1903 syn. nov., this being the senior name for the taxon referred to as Xylocopa insularis sensu auctorum.

A neotype is designated for Bombus coeruleus Fabricius, 1804 in order to preserve the current usage of this name (as a species of Xylocopa). The presentation of this illustrated type catalogue highlights both the extraordinary ground-breaking work of Wallace and Smith, but also the paucity of revisionary work on bees in Southeast Asia which has been carried out since then, particularly in the Wallacean region; it is hoped that this catalogue will facilitate and stimulate future work in this area.