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The Identification of the Anopheline Mosquitoes of Porto Rico^1,2,

Because of certain well defined characteristics and peculiarities it is usually possible to identify the adults of the anopheline mosquitoes of Porto Rico with the naked eye. The position assumed by the living A. grabhamii when at rest is unmistakable; A. albimanus alone has the distinct snow white markings on the terminal four tarsi of the hind legs, and the tip of the palpi; while the general darker appearance of A. vestitipennis, with the white bands on the tarsi of the hind legs and the absence of the markings characteristic of the other two species, is adequate for identification.

For the identification of the larvae, one finds that A. albimanus alone has heavily branched, inner and median, sub-median thoracic hairs, palmate hairs on the thorax and on the first and second abdominal segments, and unbranched lateral abdominal hairs on the fourth to sixth segments. The peculiar fan shaped branching of the outer anterior clypeal hairs are characteristic of A. grabhamii; the difference in distance between the inner anterior clypeal hairs at point of origin is likewise of importance. In the larva of A. vestitipennis the large antennal hair and the structure of the outer anterior clypeal hairs differ distinctly from similar structures in the other two species and are sufficient for identification.

¹ The studies and observations on which this paper is based were conducted with the support and under the auspices of the International Health Division of the Rockefeller Foundation.

² The writer is indebted to Dr. Walter C. Earle for suggestions and for much of the information included in this paper. He is also under obligations to the Commissioner of Health of Porto Rico and to the Insular Department of Health for their cooperation.