CONTRIBUTIONS TOWARD A REVISION OF THE GENUS ATRICHOPOGON BASED ON CHARACTERS OF ALL STAGES (DIPTERA, HELEIDAE)

The metamorphosis of 19 Atrichopogon species, 14 of which are described as new, is treated from a morphological point of view. Most of the characters that are employed in distinguishing adults of the species are of a quantitative nature and subject to great individual variation. Hence, we are forced to base the taxonomy to a great extent upon the immature stages; and yet at present the genus can be clearly separated from Forcipomyia only by adult characters. Three broad groups are distinguished on the basis of larval morphology. They are presented with the object of providing a foundation for the establishment of subgenera in the future when more material becomes available.