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Observations on Anopheles (Kertezia) Bellator D. & K. in British Guiana^*

L. J. Charles

1. The geographic distribution of the subgenus Kertezia of Anopheles in general, and of Anopheles bellator in particular is reviewed.

2. A new record for A. bellator is reported in British Guiana where it was found in the upper reaches of all the rivers in the North West District adjoining a known focus in eastern Venezuela.

3. A. bellator was found also in the Potaro River, on the Kaieteur escarpment, and on the east bank of the Essequibo River. High rainfall was a common feature in all these areas.

4. Larval findings indicative of the presence in the North West District of one or more other species of Kertezia are recorded.

5. The principal bromeliad host plants for A. bellator were the arboreals Guzmania capituligera, G. Altsonii, Vriesia platynema, V. albiflora, Wittmackia odora; and the large terrestrial plant Brocchinia micrantha.

6. High densities of adult A. bellator were recorded only at Kaieteur Falls, but in a small Amerindian community in the North West District epidemiological evidence of active malaria transmission is presented.

7. The potentialities of extended A. bellator malaria are briefly reviewed in relation to future development in the hinterlands.

^* The observations recorded in this paper were carried out partly in 1952–1954 during a tour of Service in British Guiana and partly in 1958 under a research grant awarded by the Standing Advisory Committee for Medical Research in the British Caribbean Territories.

Specialist Malariologist, Ministry of Health, Accra, Ghana.