For the last few months I have been using a beech tree-hole in Epping Forest as a source of supply of Anopheles plumbeus; and it has been our custom to collect larvae from the hole and transfer them to the laboratory at Sandwich, where the development is continued under artificial conditions. In this way we have been able to obtain large numbers of Anopheles plumbeus and Ochlerotatus geniculatus, together with the recently discovered Orthopodomyia albionensis as an associate. Not long after finding the Orthopodomyia, I was surprised to find yet another species from the same tree-hole, two male Stegomyia fasciata, emerging from the tank containing the mixed larvae from Epping Forest. The speciemens were of normal size, and we now have them preserved in our collection here.