RESUMO
<I>Simulium</I> (<I>Simulium</I>) <I>chanyae</I> sp. nov. is described based on two female adult specimens collected in Northern Thailand. This new species is assigned to the <I>multistriatum</I> species-group of the subgenus <I>Simulium</I> (<I>Simulium</I>), and is easily distinguished from most of the other known species of this species-group by the yellowish legs.
RESUMO
<I>Simulium</I> (<I>Nevermannia</I>) <I>satakei</I> sp. nov. is described on the basis of the pupa and mature larvae collected from the Ogasawara (Bonin) Islands in Japan. This new species, tentatively (due to lack of the adult stage) assigned to the <I>vernum</I> species-group of the subgenus <I>Nevermannia</I>, is characterized in the pupa by four gill filaments lacking transverse ridges, and in the larva by a small, M-shaped postgenal cleft, antenna without hyaline bands, and simple rectal papilla. The morphological differences among this new species and the two known species, <I>S</I>. (<I>N</I>.) <I>uemotoi</I> from Japan and <I>S</I>. (<I>N</I>.) <I>karzhantacum</I> from Uzbekistan and Turkmenistan, are noted. This is the second species of the family Simuliidae from the Islands.
RESUMO
Two new species of black flies, <I>Simulium</I> (<I>Nevermannia</I>) <I>fruticosum</I> sp. nov. and <I>S</I>. (<I>N</I>.) <I>chiangklangense</I> sp. nov. are described on the basis of samples collected in northern Thailand. These new species are assigned to the <I>feuerborni</I> species-group of the subgenus <I>Simulium</I> (<I>Nevermannia</I>), and are easily distinguished from <I>S</I>. (<I>N</I>.) <I>feuerborni</I> Edwards, the only species of the same group known thus far in Thailand, by their simple cocoon without any anterodorsal projection.
RESUMO
Forty-five known species of <I>Simulium</I> Latreille s. l. in Thailand are listed, and keys to subgenera and species within each subgenus are provided for adults, pupae and mature larvae.