Factors in the transmission and prevention of malaria in the Panama Canal Zone / by S.T. Darling.

  • Samuel Taylor Darling
Date:
1910
Catalogue details

Licence: Public Domain Mark

Credit: Factors in the transmission and prevention of malaria in the Panama Canal Zone / by S.T. Darling. Source: Wellcome Collection.

    5/50 page 181
    The following ts a list of Anophelines of the Canal Zone : —- Cellia argyrotarsts, R.D. Cellia tarstmaculata, Goeldi Cellia(?) gorgast, D.K. Cellia albimana, Wied. Anopheles (?) cruzi, D.K. Anopheles (?) apicimacula, D.K. Anopheles (?) punctimaculata, D.K. Arribalzagia / ?) malefactor, D.K. Anopheles (?) etsent, Coquill Anopheles franctsanus, McCrack Anopheles pseudopunctipennis, Theob. The above eleven species of Anophelines have been collected in the Canal Zone during the past five years. They are not taken, nor do they exist in their breeding places, in anything like equal numbers. For example: Only one specimen of Ce. (?) gorgast has been found. Of the eleven species, the commonest ones are Ce. albzmana., A. pseudo punctipennis and Arr. (?) malefactor, but this again must be qualified by stating that the predominance of a species varies from season to season and from place to place. In certain villages, upon going through the barracks only Ce. albzmana will be found, while in other villages, from five to ten per cent. of the mosquitos will be A. pseudo punctipennis, and at Ancon during October, 1908, 27 per cent. were A. malefactor and 72 per cent. Ce. albimana. Mr. A. Busck, of the Bureau of Entomology, United States Department of Agriculture, who collected and made observations on Zone mosquitos during 1907, gave it as his opinion that A. pseudo puncti- pennis was the commonest Anopheline during the period of his stay. The necessities of the canal operations in excavating and filling, change the topography of districts and localities so as sometimes to convert salt marshes into fresh water ponds, or to make tracts of land containing few Anophelines, into a vast swamp in which they luxuriate. On the other hand, swamps and breeding places may be drained or filled in the work of excavation. These factors, among others, influence the number and variety of species in a locality. The commoner Anophelines of the Canal Zone may be divided into three groups :—
    digitised image 1
    digitised image 2
    digitised image 3