Cephalic secretions of the bumblebee subgenus Sibiricobombus Vogt suggest Bombus niveatus Kriechbaumer and Bombus vorticosus Gerstaecker are conspecific (Hymenoptera, Apidae, Bombus)

Journal: Apidologie
Year: 2005
Volume: 36
Issue: 4
Pages: 571 - 584