Drosophila pavlovskiana, a Race or a Species?

Abstract
A new species, Drosophila pavlovskiana Kastritsls and Dobzhansky, is described. It was encountered in two localities in British Guiana and originally considered as a Gulanan race of Drosophila paulistorum Dobzhansky and Pavan. A more detailed study has shown that it must be considered specifically distinct.