Abstract
Two new blackfly species, Simulium (Simulium) sigiti sp. nov. and S. (S.) javaense sp. nov. are described based on the female, male, pupal and larval specimens collected from Java. Simulium (S.) sigiti is characterized by the presence of a pit-like cuticular organ at the base of pupal gill, as well as shortened pupal filaments. This is the first species of the tuberosum group from Java. The variety of S. (S.) iridescens De Meijere, 1913 is here elevated to the species status and is given a new specific name S. (S.) javaense sp. nov. This new species is easily distinguished from S. (S.) iridescens by the inflated gill filaments, the absence of tubercles on the cephalic and thoracic integuments of the pupa, and the russet body coloration of the larva.
