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This is another in the series of excellent maps prepared by the American Geographical Society and showing the distribution of arthropod vectors of disease. The present map shows the general areas of occurrence of the arthropods involved in the transmission of rickettsial diseases. The area of distribution given for the various tick and mite vectors represents the area in which the vectors have been reported as present and not intended to be interpreted as limitative. The vectors dealt with on the map belong to the orders Hemiptera and Acarina. The Acarina dealt with comprise the three families Argasidae, Ixodidae and Trombidiidae. The families Cimicidae (order Hemiptera) are included in the discussion on the reverse side of the map, together with the other vectors mentioned above.
The distribution of the several vectors is very clearly presented, and the reader can obtain at a glance a very good idea of the areas of occurrence of these arthropods.
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