Compteromesa Sther (Diptera, Chironomidae, Prodiamesinae) newly recorded in China with the description of a new species.

Compteromesa haradensis Niitsuma et Makarchenko, 1997 is redescribed based on the male adults, pupae and larvae collected from China. Supplemental data are provided here for emending the previous inaccurate descriptions. In addition, a new species, Compteromesa biramosa Tang et Niitsuma, sp. n., is described based on a single male with peculiar morphological features from Yunnan Province, China, tentatively as a member of Compteromesa, which is characteristic in having bare wings and bilobed gonostyli.

Revision of the Chinese Macropelopia (Diptera: Chironomidae: Tanypodinae), with description of a new species.

The Chinese species of Macropelopia Thienemann are reviewed. A new species belonging to the subgenus Macropelopia, M. (M.) pergrandis sp. n., is described based on the adult male and pupa. Macropelopia grandivolsella Wang, Cheng et Wang and M. rotunda Wang, Cheng et Wang are synonymized with M. (M.) paranebulosa Fittkau and M. (M.) kibunensis (Tokunaga) respectively, based on reexamination of the type materials. Macropelopia galbina Wang, Cheng et Wang is transferred to the genus Brundiniella, and the male holotype is redescribed.

Review of the genus Amnihayesomyia Niitsuma (Diptera: Chironomidae: Tanypodinae), with descriptions of three new species from China.

Three new species of Amnihayesomyia are described from China: A. vittata sp. n. and A. tibetica sp. n. each based on the male and female adults, and A. subflava sp. n. based on the male adult. In addition, a key to the known males of this genus is provided.

Taxonomic review of Ablabesmyia Johannsen (Diptera: Chironomidae: Tanypodinae) from Oriental China, with descriptions of six new species.

Six new species of the genus Ablabesmyia are described and illustrated from Oriental China: A. (Ablabesmyia) lyrata sp. n. and A. (Ablabesmyia) pectinata sp. n. each based on the male adult and pupa; and A. (Ablabesmyia) huananensis sp. n., A. (Ablabesmyia) praegracilis sp. n., A. (Ablabesmyia) bifurca sp. n. and A. (Karelia) daiensis sp. n. each based on the male adult. The subgenus Karelia is recorded from China for the first time. In addition, A. (Ablabesmyia) alba Chaudhuri, Debnath et Nandi and A. (Ablabesmyia) maculitibialis Chaudhuri, Debnath et Nandi are redescribed based on the male adult, and new distribution records are given for A. (Ablabesmyia) prorasha Kobayashi et Kubota, A. (Ablabesmyia) amamisimplex Sasa and A. (Ablabesmyia) jogancornua Sasa et Okazawa.

Notes on the genus Conchapelopia Fittkau (Diptera: Chironomidae: Tanypodinae) from southern China, with description of a new species.

Two interesting species, Conchapelopia togamaculosa Sasa & Okazawa and a new species, Conchapelopia brachiata sp. n., were collected from southern China. The male, pupa and larva of the new species are described, and new distributions of the former species are noted. Although the male of the new species is very distinct from that of the former in the hypopygial median volsella, the pupa and larva stunningly resemble those of the former.

Two species of Nilothauma Kieffer (Diptera, Chironomidae) from Japan, with description of a new species.

The male and female adults and pupa of Nilothauma niidaense n. sp. are described and illustrated on the basis of the material collected from a fontal stream in Fukushima Prefecture, Japan. N. sasai Adam & Sæther is treated as a junior synonym of N. hibaratertium Sasa, of which the male is redescribed. The Adam & Sæther key to Nilothauma males is revised.

A new species of Bilyjomyia Niitsuma et Watson from Japan, with keys to species of the genus (Diptera: Chironomidae).

Descriptions of the male, female imagos, pupa and larva are given for Bilyjomyia parallela n. sp. collected from Japan. This is the third known species belonging to the genus Bilyjomyia. Keys to species of the genus are provided.

Revision of the Japanese Ablabesmyia (Diptera: Chironomidae: Tanypodinae), with descriptions of three new species.

The Japanese species of Ablabesmyia Johannsen are reviewed on the basis of the type material and the specimens obtained recently. Four species of the subgenus Ablabesmyia, A. (A.) monilis (Linnaeus), A. (A.) amamisimplex Sasa, A. (A.)jogancornua Sasa et Okazawa and A. (A.) prorasha Kobayashi et Kubota, are recognized as valid. The adults, male and female, and the immature stages, pupa and larva, of the first species and the adult males of the remaining are redescribed, while the female adults and both immature stages of A. (A.) amamisimplex and A. (A.) jogancornua, and both immature stages of A. (A.) prorasha are described here for the first time. Reexamination of the holotypes of A. (A.) amamisimplex and A. (A.) jogancornua has shown that the respective original descriptions contain errors in some diagnostic aspects, which are corrected in this study. In addition, the male and female adults, pupa and larva of a new species of the subgenus Karelia Roback, A. (K.) nakarchenkoi n. sp., and the male adults of two new species, A. (K.) lata n. sp. and A. (K.) perexilis n. sp., are described and illustrated.