Taxonomic notes on the griseifrons species-group in Simulium (Simulium) (Diptera: Simuliidae) from Thailand: Descriptions of two new species and description of the male, pupa and larva of S. (S.) digrammicum Edwards.

Two new black-fly species, Simulium maenoi sp. nov. and S. choochotei sp. nov. are described, based on the reared females, reared males, pupae and mature larvae collected in Chiang Mai Province, northern Thailand. In addition, the male, pupa and mature larva of S. digrammicum Edwards, 1928, originally described from Peninsular Malaysia and Thailand, are described for the first time. All these three species are assigned to the griseifrons species-group within Simulium (Simulium) Latreille s. str.