[17]

Mar. 28/67/ B. Museum Insects S Selection

In Coleoptera the only cases of colour sexual differences is a Trichius from S Leone in which male much obscurer, but female far from handsome but with much more obscure red. In Tillus Elongatus the ♂ is black & female believed always to be dark blue with red Thorax -

It is curious the difference in orders - I doubt whether habits will account for this. What wd destroy female Libellulæ?

In Diptera Mr. F. Walker thinks greatest difference in Bibio in which male blacker or quite black & female obscure orange.

[18]

We must remember that males & females in extreme cases often differ in habits.

Mr. F. Smith showed me in Anthophora retusa in which males quite black & very different from females.

In Sirex sexes generally differ: in S. juvencus the females lack purple, male banded with orange - but hard to say which most conspicuous.