MartinV writes:
Wasp are aposematic, bees not.
You still haven't supported this statement.
MartinV writes:
But why do not bees protect themselves also by aposematism
They do, in many species. You say that the European honey bees you're familiar with are cryptic? We are talking about
Apis mellifera here, right? With the classic yellow and black stripes on the abdomen? Like this one:
Also, that first picture of
Eristalis tenax you linked to (although oddly, you seemed to indicate that the link was for a honey bee) wasn't exactly typical of its patterning. Here's a dorsal view, showing a typical (and aposematic) patterning of that species, yellow and black:
I'd love to see these cryptic honeybees you're talking about!