Stelis (Malanthidium), Malanthidium Pasteels, 1969

Nalinrachatakan, Pakorn, Traiyasut, Prapun, Khongnak, Anupong, Muangkam, Manop, Ascher, John S. & Warrit, Natapot, 2021, The resin bee subgenus Ranthidiellum in Thailand (Megachilidae, Anthidiini): nesting biology, cleptoparasitism by Stelis, and new species, ZooKeys 1031, pp. 161-182 : 161

Subgenus Malanthidium Pasteels, 1969

Malanthidium Pasteels, 1969: 26. Type species: Anthidium malaccense Friese, 1914, by original designation.

Remarks.

Malanthidium has an elongated body form, resembling most Euaspis species, and is of moderate size (8-11 mm). Only males are known. Straight subantennal suture; mandible tridentate; preoccipital margin rounded; omaulus carinated but not reaching ventral rim; distinct postero-lateral hook on axilla; scutellum large, rounded, and protruding posteriorly to overhang propodeum; wing dark brown to black; 2nd recurrent vein enters distal to 2nd submarginal crossvein; T6 margin with conspicuous border; S1 premarginal carina strong; S7 ventral surface smooth, margin with small median tooth.