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Studies on the Breeding Places and Control of Anopheles gambiae and A. gambiae var. melas in Coastal Districts of Sierra Leone

Published online by Cambridge University Press:  10 July 2009

R. C. Muirhead Thomson
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The eggs of A. gambiae var. melas are distinctly different from those of typical gambiae, and it is now regarded as a distinct species, A. melas. Other workers have found that the larvae also differ, physiologically and structurally. All adults with an extra dark band on the palps—4-banded forms— are known to be melas, but those adults with normal 3-banded palps can so far only be distinguished from typical gambiae by egg characters.

A. melas is now known to be an important vector of malaria in coastal districts in West Africa. In some estuarine and mangrove swamp areas it may be even more important than typical gambiae. In melas caught in Freetown estuary (mostly from Wellington village), 42 out of 1,000 glands dissected were positive, giving a sporozoite rate of 4·2 per cent. for all months of the year. The oocyst rate was 4·7 per cent., and the total infection rate was 7·8 per cent.

In Freetown estuary melas is rare in Freetown itself, and in the adjoining village of Kissy, but in all other parts of the estuary is at least as important as typical gambiae. In many places it is the dominant vector. In Wellington to the east of Kissy, and on the Bullom shore which forms the north shore of the estuary, melas forms about 90 per cent. of Anophelines caught in houses.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 36 , Issue 2 , June 1946 , pp. 185 - 252
Copyright
Copyright © Cambridge University Press 1946

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References

Barber, M. A. & Olinger, M. T. (1931). Ann. trop. Med. Parasit., 25, pp. 461–508.CrossRefGoogle Scholar
Barber, M. A., Rice, J. B. & Brown, J. Y. (1932). Amer. J. Hyg., 15, pp. 601–633.Google Scholar
Blacklock, D. B. (1921). Ann. trop. Med. Parasit., 15, pp. 463–471.CrossRefGoogle Scholar
Blacklock, D. B. & Evans, A. M. (1926). Ann. trop. Med. Parasit., 20, pp.59–84.CrossRefGoogle Scholar
Blacklock, D. B. & Wilson, C. (1941). Ann. trop. Med. Parasit., 35, pp. 37–42.CrossRefGoogle Scholar
Blacklock, D. B. & Wilson, C. (1942a). Ann. trop. Med. Parasit., 36, pp. 187–191.CrossRefGoogle Scholar
Blacklock, D. B. & Wilson, C. (1942b). Ann. trop. Med. Parasit., 36, pp. 182–186.CrossRefGoogle Scholar
Davey, T. H. (1938). Rep. med. Serv. Sierra Leone. Appendix D.Google Scholar
Davey, T. H. (1940). Key to the Anophelines of Sierra Leone. Freetown.Google Scholar
Evans, A. M. (1931). Ann. trop. Med. Parasit., 25, pp. 443–453.CrossRefGoogle Scholar
Evans, A. M. (1931). Ann. trop. Med. Parasit., 25, pp. 443–453.CrossRefGoogle Scholar
Evans, A. M. (1938). Mosquitoes of the Ethiopian Region, II. Anophelini. London, British Museum (Natural History).Google Scholar
Glanville, R. R. (1930). Agricultural survey of the existing and potential rice lands in the swamp areas of the Little Scarcies, Great Scarcies, Port Loko, and Rokel Rivers. Sierra Leone, Govt. Printer. 39 pp.Google Scholar
Gordon, R. M., Hicks, E. P., Davey, T. H. & Watson, M. (1932). Ann. trop. Med. Parasit., 26, pp. 273–345.CrossRefGoogle Scholar
Leeson, H. S. (1937). Bull. ent. Res., 28, pp. 587–603.CrossRefGoogle Scholar
Leeson, H. S.(1939). Bull. ent. Res., 30, pp. 129–161.CrossRefGoogle Scholar
Mackay, R. (1938). Second (Final) Report of the Malaria Unit, Dar-es-Salaam, for the period November, 1934, to December, 1936. Dar-es-Salaam, Govt. Printer.Google Scholar
Macluskie, H. (1943). Farm & Forest, 4, pp. 155–160.Google Scholar
Ribbands, C. R. (1944a). Ann. trop. Med. Parasit., 38, pp. 85–99.CrossRefGoogle Scholar
Ribbands, C. R. (1944b). Bull. ent. Res., 35, pp. 271–295.CrossRefGoogle Scholar
Ross, R. (1902). Mosquito brigades and how to organize them. London, G. Philip & Son.Google Scholar
Ross, R.Annett, H. E. & Austen, E. E. (1902). Report of the Malaria Expedition to West Africa.—Mem. L'pool Sch. trop. Med., 2.Google Scholar
Russell, P. F. & Ramachandra Rao, T. (1942). Bull. ent. Res., 32, pp. 341–361.CrossRefGoogle Scholar
Russell, P. F. & Ramanatha Rao, H. (1940). J. Malar. Inst. India, 3, pp. 427–446.Google Scholar
Schwetz, J., Collart, A., & Geerinck, . (1929). Trans. R. Soc. trop. Med. Hyg., 22, pp. 457–463.CrossRefGoogle Scholar
Soper, F. & Wilson, D. B. (1943). Anopheles gambiae in Brazil, 1930 to 1940. New York, Rockefeller Foundation.Google Scholar
Thomson, R. C. M. (1940). J. Malar. Inst. India, 3, pp. 265–348.Google Scholar
Thomson, R. C. M. (1942) J. Malar. Inst. India, 4, pp. 595–610.Google Scholar