The Empididae is a family in the order Diptera and it includes more than 4 thousand described
species around the world and probably this number will exceed 7,5 thousand species, being one
of the largest Diptera ́s family. It is divided in three subfamilies: Hemerodromiinae, Empidinae
and Clinocerinae. Porphyrochroa Melander, 1928 is one of the 29 Empidinae ́s genera. Currently
it has 35 species, 14 in Brazil, 6 in Peru, 5 in Bolivia, 5 in Dominican Republic, 3 in Mexico, 1 in
Guyana and 1 in Panama. Only three species from Brazilian Amazonic Region were known until
now. In order to increase the taxonomic and geographical distribution knowledge of the
Porphyrochroa ́s Amazonian species, it was about 500 specimens from Acre, Amazonas and
Roraima were studied based on external morphology and genitalia, all them deposited at INPA
Entomological Collection. The abdomen of the male specimens was and the terminalia was
macerated in hot lactic acid 85% during variable time, depending on the abdominal
sclerotinization degree. After maceration, the peaces were transferred to excavated slides with
glycerin and the genitalic pieces were illustrated. A phylogenetic study with the 17 Amazonian
new species, described here and more 8 species already described from other regions, was made
and resulted in differentent biogeografic groups of species.
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