Abstract
Baited vial traps were used to determine quantitatively the species composition and seasonal distribution of drosophilids in the Beltsville area in 1961. Trapping was done twice weekly in each of 11 1/4-acre fields during most of the season. Results showed that 15 species of Drosophilidae and some other species of flies were present in tomato fields. Excluding Drosophila melanogaster only 3 species of Drosophila were present throughout the season. Trapping records showed that P. melanogaster comprised 92-99% of the population during the period of greatest abundance.

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