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A Study of the Effective Flight Range, Density, and Seasonal Fluctuations in the Abundance of Anopheles Quadrimaculatus Say in Delaware^1,2,

A study is reported which confirms previously-published conclusions that, under normal conditions, A. quadrimaculatus does not move in significant numbers more than 1 mile from its breeding sources. However, an unusual condition is described where this species was observed to move 1 mile from its breeding areas in sufficient numbers to create a dangerous density—250 females per barn or shed per inspection. Near the sources of production, densities as high as 15,000 to 25,000 females per station per inspection are noted as very common, and one such record of 40,000 is included. In the study-locality (Fort duPont, Delaware) broods of this species are indicated at about monthly intervals during the summer season.

¹ This paper is the result of work carried on under the joint sponsorship of the Delaware Agricultural Experiment Station and the Delaware State Highway Department, Mosquito Control Division. The study was accomplished under the supervision of Dr. Paul L. Rice, Acting Head of the Department of Entomology of the Experiment Station. This is publication 193 and scientific article 119 by that department.

² The authors wish to express their appreciation to Dr. L. A. Stearns for suggesting the investigation and for valuable contributions toward the plan of the work; and to Dr. Paul L. Rice, for many useful suggestions concerning the manuscript.

³ At present, with the Health and Sanitation Division of the Institute of Inter-American Affairs, Bogota, Colombia, S. A.