90 REMARKS ON COLLECTING DIPTERA. I have probably forty other unnamed species from the Forest, chiefly Dolichopodidae, Anthomyidae, and Acalypterate Muscidae Next season I hope to give a more complete list. I should like to add, in conclusion, that a good start may be made in collecting Diptera without going far from London, as I have taken about eighty species in London itself, while probably approaching 2000 species may occur within a twenty miles radius from Charing Cross. I trust that the above remarks may be interesting and useful to the members, and that I shall be able to give another paper in a future number illustrated with diagrams. [Owing to the difference of opinion as to the necessity or advantage of "set- ting" Diptera, or of simply pinning them, allowing wings and legs to adjust themselves by chance, closed or unclosed, extended or contracted, we applied to our member, Mr. Verrall, for his opinion, and he has very kindly sent the follow- ing note on the subject. We think that any member proposing to collect Diptera for the Club's museum, or even for faunistic purposes, should take all the care possible so to conserve the specimens that they may be pleasing to the eye, and as easy as possible to determine. The time so spent really cannot be considered