It is a well-known fact that the eggs of Stegomyia fasciata are highly resistant to conditions adverse to their normal development.

In April 1915 I received through the Colonial Office a few dried leaves from West Africa, on which—secured by a fine mud deposit—were eggs of this mosquito that had been in a dried condition for at least three and a half months. These were found to be viable and were successfully hatched and reared for many successive generations, as described in a recent paper.