Abstract
Emended diagnoses of all stages of the subgenus Symposiocladius Cranston of the genus Orthocladius v. d. Wulp are given. The male imagines of the subgenus share absence of virga, collar-like superior volsella, and ventral part of inferior volsella not extended prominently below dorsal part. The larvae have prominent circular Lauterborn organs, often weak pecten galearis and vestigial premandibular brush, and usually setal brushes on abdomen. O. (S.) schnelli sp. n. and O. (S) halvorseni sp. n. are described and O. (S.) annectens Sæther redescribed in all stages and both sexes, O. (S.) bilyji sp. n. as male and female imago and pupa, and O. (S.) smolandicus Brundin, not Soponis, redescribed as male imago. Other included species are O. (S.) lignicola Kieffer, O. (S.) holsatus Goetghebuer, and O. (S.) lunzensis Dettinger-Klemm. Keys to species for all stages are given.
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