Abstract
The species of these two genera from America north of Mexico, have been considered by Williston in Volume XII, of the Transactions of the American Entomological Society, and the Mexican species of Promachus have been tabulated by Osten Sacken in Biologia, Diptera I, 192. The fact that it has been possible to get together an extensive collection of specimens of various species from different parts of North America has led me to make an attempt to identify many of the Nearctic forms, and as some success at least has been attained the following results are offered for the consideration of those, who for any reasons, have interest in the various species included.
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