Remarks on certain American Diptera in the Leyden Museum and description of nine new species

Having been occupied of late with the determination of a large number of Diptera from North- and South-America, I have also examined the Diptera from these parts of the world, which are in the Leyden Museum. Some of them, which were already described, have given me occasion for making certain remarks on the synonymy etc., whilst a few appear to be hitherto undescribed. The following pages contain the results of my researches.