. Annals of the Entomological Society of America. Entomology. 1912] Mediterranean Fruit Flies 403 the mountains rise very abruptly but in general the slope is quite gradual. The bottom of the valley consists largely of taro patches, (PI. XXX). At the head end of the valley, in a circle about a half mile in diameter, fifty kerosene traps were wired among the branches of citrus, fig, guava, hau and tropical almond trees. In a previous experiment we found that of every thousand Medit- erranean fruit flies captured in kerosene only three were females and for this reason only marked males were used
. Annals of the Entomological Society of America. Entomology. 1912] Mediterranean Fruit Flies 403 the mountains rise very abruptly but in general the slope is quite gradual. The bottom of the valley consists largely of taro patches, (PI. XXX). At the head end of the valley, in a circle about a half mile in diameter, fifty kerosene traps were wired among the branches of citrus, fig, guava, hau and tropical almond trees. In a previous experiment we found that of every thousand Medit- erranean fruit flies captured in kerosene only three were females and for this reason only marked males were Fig. 2. Kerosene trap wired to a branch of a lemon tree. The white enameled pan containing the oil is covered with a galvanized iron cover to keep out the rain. The fruit flies enter the trap in the space between the cover and the rim of the pan. The Mediterranean fruit flies were set free in lots containing from two to six hundred specimens. When the first lot of flies were set free, the jars containing the marked individuals were. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of America. [College Park, Md. , etc. ] : Entomological Society of America
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectentomology, bookyear1
