The intermediary hosts of malaria in the Netherlands Indies / by Frank H. Taylor.

  • Taylor, Frank H. (Frank Henry), 1886-1945.
Date:
1943
Catalogue details

Licence: In copyright

Credit: The intermediary hosts of malaria in the Netherlands Indies / by Frank H. Taylor. Source: Wellcome Collection.

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    man with some reluctance, not more than about 48 per cent, feeding on human blood when offered to starved specimens in captivity. Relation to Malaria.—Experimental infections have been obtained in Malaya and in the Dutch East Indies with M.T. and B.T. malaria. Although not an avid feeder on human blood, it is relatively highly susceptible in the laboratory. JSTatural infections have been observed in the Dutch East Indies and Assam. In the former, heavy infection rates have been reported and it has been stated to have been the cause of an epidemic. In Malaya, it is often very common but has never been considered as of any importance. It should, perhaps, be regarded with suspicion. Larva.—Inner anterior clypeal (Fig. 8).—Placed com¬ paratively very far apart, three times the distance between the inner and outer hairs on one side ; fine, simple or with very fine side-hairs ; two or three side-hairs sometimes prominent, appearing like fine branches. Outer anterior clypeal: About one-quarter the length of inner ; fine, simple, but sometimes forked at tip. Posterior clypeal: Placed far back, nearly half¬ way between frontal and anterior clypeal hairs ; external to inner anterior but in line with, external, or internal to outer anterior. Sutural: Longer (sometimes two or three times) than posterior clypeal; simple or forked at tip. Trans-sutural : As long as sutural and in line with or slightly in advance of them ; simple or with 2 or 3 branches distally. Antennal: On dorso-external surface, one-quarter to one-third the length of shaft from the base ; fine, very short. Sub-median pro- thoracic (Fig. 8) : Inner longer than outer ; weak, with 7 to 10 branches or less ; central with 11 to 15 branches and a fairly prominent root. Metathoracic palmate : Fairly well developed, with 9 to 12 lanceolate leaflets. Pleural: Pro thoracic with 3 long simple, 1 short simple or bifid. Mesothoracic with 2 long, 1 short and 1 minute, all simple. Metathoracic with 2 long simple, 1 short with 2 or 3 branches, 1 minute simple. Abdominal palmate : I (Fig. 8) small, with narrow lanceolate leaflets or filamentous branches ; II (Fig. 8) larger, with lanceolate leaflets or leaflets showing a few indentations ; III to VI (Fig. 8) fully developed, the filament with broad base and very fine tip, the latter often broken off, giving the appearance of a blunt filament ; pigmentation heavier proximally, the tips of leaflets clear. Notes.—Antenna very lightly pigmented. Habitat.—Drains, pools, swamps, miscellaneous, rice-fields, wells, u artificial ”, seepages, streams, ponds. Often found in small collections of muddy water in roads and near houses. In rice-fields it is found in the small, muddy pools after the water is drained off for harvest. Anopheles (Myzomyia) leucosphyrus Donitz. Insektenborse, XVIII, 1901, 37. Medium size, highly ornamented, the hind tibio-tarsal joint conspicuously white. Labium (Fig. 9).—Slightly longer than palpi, smooth distally, shaggy basally, especially ventrally, unornamented ; antennae with scales on segment 3.
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