As a general rule you are aware that throughout the Aculeate Hymenoptera the male is much smaller than the female, whenever the reverse occurs it is for a special purpose; as far as my observation has extended, in the following species it is a beautiful adaptation to a singular point in the economy of the insects; Apis mellifera ♂. Anthidium manicatum & Anthophora acervorum amongst the bees, and Methoca ichneumonides amongst the Fossores²—all carry off the females & copulate in the air.

My dear Sir

I have added this but dont know whether it may in any way fall into your investigations

believe me | Yours truly | Fred^k Smith