Over a quarter of a century has now elapsed since the genius of Ross convicted mosquitos of responsibility for the spread of malaria, but the factors involved in the distribution of the insects in Nature are hardly better understood to-day—when, in addition to filariasis and malaria, they have been inculpated in respect of the transmission of at least two other major diseases—than they were at the time of the original discovery of August 1897.

The writer had exceptional opportunities for studying sugar-cane moth borers while engaged as entomologist to one of the most progressive cane-growing concerns in British Guiana from September 1922 until January 1925. The observations and data that follow refer to some three thousand acres of typical cultivation situated on the west bank of the Berbice River, nearly opposite the town of New Amsterdam, in which locality the borer pest probably reaches its maximum in destructiveness.

In this paper the species of Aleyrodidae occurring in Ceylon are listed, and the descriptions of two genera and nineteen species new to science are included.

The present paper reports on a few Copeognatha received by the author for determination from the Imperial Bureau of Entomology, for which I am very much indebted to the kindness of the Director, Dr. Guy A. K. Marshall. Unfortunately all the specimens were dried and carded, so that it is impossible in some cases to give as full descriptions as are desirable for complete characterisation of the species, and as would have been done if there had been alcohol material at my disposal. Never-theless, it seems desirable to record all the species before me, as nothing has been known hitherto regarding the Copeognath fauna of the Fiji Islands.