Volume s1-22, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645


Summary and Conclusions

In the area selected for this investigation, which included two scattered communities in the cocoa growing districts of Tamana Reserve, four species of were found: , and and were rare and could be collected with regularity, but none of these species is abundant enough, under present conditions, to be involved in the transmission of malaria in this highly malarious area of Trinidad. , the predominant species, was present in great numbers.

attacked man viciously, literally swarming about people during the hours when the females became active. Although attracted to cows and donkeys, it seemed to prefer the blood of man to that of animals. fed readily on man, but appeared to be associated primarily with animals, especially cattle.

will attack man throughout the afternoon, especially on dark days and in the shade of the forest, but the real flight begins at about 5:30 p.m., and continues until about 8:00 p.m., with the peak occurring between 6:30 and 7:00 p.m. The species becomes active early in the morning also, between four and six-thirty o'clock, but the morning flight is light as compared with the evening flight.

will feed on man both indoors and out of doors. It will enter houses, and even bed nets, in search of human blood, but it attacks more readily out of doors or under the roofs of cocoa-drying or similar sheds without walls. The females do not remain in houses after feeding, but return immediately to their jungle resting places.

The larvae of were found only in Bromeliaceae, and of four species of bromeliads examined, the larvae were collected from two: a species of , and one of is the chief producing bromeliad in Trinidad.

Experimental infections of were obtained twice, and proved that the species is very susceptible to at least one of the species of causing human malaria. Oöcysts were found in two of four that fed on a gametocyte carrier.

Three of 725 “wild” were found to be naturally infected with ; one had a single mature oöcyst on the stomach wall, another had infected salivary glands, and the third had nine small oöcysts on the stomach wall.

The evidence presented confirms the conclusion of De Verteuil, that is the vector of malaria in the interior cocoa growing districts of Trinidad.


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  • Received : 29 Oct 1941
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