Studies on the chironomid midges (Diptera, Chironomidae) of the Lake Toba area, Sumatra, Indonesia

Abstract

The senior author visited Lake Toba, Sumatra, Indonesia, three times during the period from January 1987 to January 1989,for the collection of chironomid midges breeding in and around this lake. The adult midges resting or swarming around the lake were collected during the daytime with insect net or sucking tubes. The midges attracted at night to a battery-operated 6-watt white light were also collected with sucking tubes or insect net. A total of 101 adult males among the collections were mounted on slides with gum-chloral medium and identified. They were classified into 31 species, or 26 species of Chironominae (19 species of Chironomini and 7 species of Tanytarsini) and 5 species of Orthocladiinae (3 species of Orthocladiini and 2 species of Metriocnemini). Among these species, 20 are described in this paper as new species, and 3 among them are considered as to belong to new genera.