A New Genus of the Tribe Gnoristini from Yunnan, China (Diptera, Mycetophilidae)

摘要

A new genus Hemisphaeronotus belonging to the Gnoristini of the family Mycetophilidae is described based on four new species, H. rotundatus, H. bilobatus, H. flavidus and H. fuscicaudatus, which were collected in Yunnan, China. The new genus is somewhat similar to the genera Boletina, Gnoriste, etc. in wing venation, but it is easily distinguished from them by the strongly humpbacked mesoscutum that expands anteriorly as an eave overlapping the head, the incompletely separated anepisternum and katepistemum of the mesothoracic pleuron, and the mesoscutellum without strong marginal setae. The new species are distinguished from each other based on body size, coloration of the thorax, and in the male by coloration and shape of the epandrium, shape of gonostylus, and the claws of the legs.