Collections recently received by the Imperial Bureau of Entomology, chiefly from Natal, have brought to light several interesting new forms in this group of flies, and their study has yielded certain unlooked for results which it appears desirable to place on record, together with descriptions of the new species, the types of which have been presented by the Bureau to the British Museum. The opportunity has been taken of publishing revised keys to the African species of Banksinetta and Taeniorhynchus.

The following are preliminary diagnoses of new species of Culicidae from Kuching, Sarawak. The specimens were received from Mr. J. C. Moulton, and either were collected by the donor, or formed part of the old collection of mosquitos in the Sarawak Museum, which was for the most part obtained in the neighbourhood of Kuching by Messrs. J. Hewitt and J. E. A. Lewis. The types are all in the British Museum.

The following notes on Tabanidae describe specimens collected and life-histories investigated during a recent visit to Southern Nyasaland on behalf of the Imperial Bureau of Entomology.

As some confusion exist in the minds of medical men in the Malay States as to the differentiation of the Anophelines ludlowi and rossi* it is probably worth while to give the following comparative notes of the two species, particularly as I believe that the larva of ludlowi has been previously held to be indistinguishabla from rossi, whereas it is in reality very distinct.

All the species described in this paper were obtained at Peradeniya, Ceylon, by Mr. A. Rutherford, the Government Entomologist, and were forwarded by him to the Imperial Bureau of Entomology for identification. In every case the types are deposited in the British Museum.

In the confusion existing as to the meaning of the various Entedonine genera, I think it best to define the sense in which Pleurotropis is employed in the following pages. The essential character of the genus is, I take it, the presence on the smooth propodaeum of two central keels, which diverge apically to meet the raised posterior edge of the segment. There are also present two lateral keels, as a rule strongly developed, running (inside the oval raised spiracle) along the edge from which the descent to the pleura begins. The lateral keels join the posterior edge above a generally slightly protruding angle inside the insertion of the metacoxae. The general shape of the propodaeum is transversely quadrate, not truncately triangular as in Entedon. The petiole, which joins the propodaeum by a distinct, though often very short, process, is pitted, quadrate or even sub-pentagonal in section. The proportion of the first abdominal tergal surface to the whole visible surface varies sexually and specifically from less than one-third to three-quarters.

In the course of an investigation of malaria in the Lampongs, a district of South Sumatra, in the months of May and June 1914, Dr. Schüffner captured a large number of Anopheline mosquitos, among them a series of specimens of a species which he recognised as new to Sumatra.

Colour black, with greyish brown scaling; the prothorax with a broad ill-defined darker stripe on each side; the elytra with a conspicuous white spot at the base of the suture, and an oblique whitish stripe about the middle, with vague and variable dark brown patches on each side of it.

The British South Africa Company have recently received a report from Mr. R. A. F. Eminson, one of the three Entomologists whom they have engaged for the special study of the bionomics of Glossina morsitans in Northern Rhodesia, upon the work done by him from May to July, 1914.

♀.—Nigra; thorace rufo-ferrugineo; segmentis dorsalibus primo secundoque apice bruneotestaceis, albo-fimbriatis; tertio etiam albo-fimbriato.