Abstract
Although the title of this paper is in accord with accepted usage it is not altogether accurate since most of the species of flies that we shall consider do suck blood avidly when the opportunity is afforded them. vSome of these flies as a matter of fact see to it that this urge for blood is satisfied-they are positively haematophagous in habit. This fact, then, would readily establish such species in the list of possible vectors of pathogenic blood-inhabiting micro-organisms of man and other vertebrated animals. I shall revert to a consideration of this matter later in this paper.
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