TextFig. 25.
Horizontal sections through the brain of Bombus agrorum. A = Female type ♀ (queen) and ☿ (worker), B = ♂ male type. Ret Retina, M.m.e, M.m.m, M.m.i lamina, medulla, and lobula, Ch.c, Ch.m outer, middle chiasma, L.olf Olfactory lobe, L.pr Protocerebral lobe, T.opt optic tubercle, F.i.a Inferior anterior fascicle. 1:52
