A morphometric study was carried out to find diagnostic characters with which to updatetaxonomic keys for field identification of Anopheles Q,,lyssorhynchus) marajoara and the 3 other sympatricAnopheles (Nyssorhynchus) species (An. darlingi, An. argyritarsis, and An. braziliensis) that occur in Venezuela.Diagnostic random amplified polymorphic DNA-polymerase chain reaction markers from wild-caught specimensshowed that An. marajoara was the only species in the Anopheles albitarsis complex collected in Venezuela.