James Duncan,
The Naturalist's Library, Bees
(1840)
“ In its present restricted sense the genus Bombus may be briefly characterised by the following definition; body oblong, and very hairy; head narrower than the thorax, usually triangular, the antennæ having thirteen joints in the female, fourteen in the male, geniculated at the second joint; exterior palpi exarticulate, interior two-jointed; ligula three-lobed, the central lobe elongated; labium transverse sub-linear; hinder tibiæ provided with a hollow expansion for collecting pollen; claws bifid at the apex. ”
