Stuidies on the Chironomid Species Collected on Ishigaki and Iriomote Islands, Southwestern Japan

Collections of adult chironomid midges were carried out by Suzuki at 3 localities on Ishigaki Island for 2 days on June 30 and July 1, and at 2 localities on Iriomote Island on July 3, 1999, by sweeping with insect net during daytime and also by using a light trap during night time. Samples of larval and pupal chironomids in rivers and streams were also collected, and the adult midges were reared in the laboratory. The specimens were mounted individually on slides with gum-chloral medium and sent to Sasa for species identification and descriptions. As the results, 21 adult male specimens were obtained from Ishigaki, and they were classified into 12 species, among which only 2 were the previously described species from Europe and also from the mainland of Japan, and other 10 were new species. From Iriomote Island, 47 specimens were obtained and were classified into 21 species, and only 1 among them were in common with the Oriental Region and the mainland of Japan, and the rest 20 were new species. Only 1 species was in common to both islands. These 32 species are classified into 19 genea, and 5 among them are described as new genera, and one was a new genus to Japan