Eriozona analis Kertesz  

Large robust Bombus-like species, mostly black except for red abdominal apex and sometimes yellow scutellum.

The two species of Eriozona are alone among the Syrphini inresembling closely in appearance certain species of Bombus, e.g. B. lapidarius (Linnaeus). However, in almost all characters except colour pattern the species of Eriozona are very similar to those of Megasyrphus; if colour is disregarded, only the bent vein R4+5 and the more densely pilose metasternum of the latter would serve to separate easily the two genera. The resemblance between the male genitalia of the two genera is remarkable; surstylus, surstylar apodeme, sternite 9, superior lobe, aedeagal base, distal portion of the aedeagus (especially in Megasyrphus and in E. analis) and even the aedeagal apodeme are extremely similar in form in the two genera. If the species of Eriozona had a Syrphus-type colour pattern as do those of Megasyrphus one would almost certainly consider them all congeneric. The conclusion is inescapable that the have been derived, probably rather rapidly, from a form very similar to Megasyrphus, probably in response to selective forces conferring an advantage upon specimens with a resemblance to certain species of Bombus (from Vockeroth 1969).