Revised description of Simulium (Simulium) forcipatum Delfinado, and description of three new related species from Luzon Island, Philippines (Diptera: Simuliidae)

摘要

The female, pupa and mature larva of Simulium (Simulium) forcipatum Delfinado are described for the first time based on the samples collected from Ifugao and Mountain Provinces, Luzon Island, the Philippines. Three species closely related to S. (S.) forcipatum, which were found from the same and/or nearby rivers or streams, are described as new species. All these four species are distinctive among the melanopus species-group of the subgenus Simulium (Simulium) Latreille s. str. in having a wall-pocket-shaped cocoon in place of the shoe-shaped or boot-shaped cocoon as well as the male ventral plate with teeth on its posteroventral surface in two vertical rows lying very close to each other.