Two New Chironomid Species (Diptera, Chironomidae) from Wrangel Island

摘要

Two new species from Wrangel Island, Orthocladius (Eudactylocladius) tschernovi sp. n. and O. (￡.) ushakovskiensis sp. n. (Orthocladiinae), are described and illustrated from on the male adults. Orthocladius (E.) tschernovi sp. n. is closely relatedto O. (E.) fascimamis (Kieffer) and O. (E.) musester SiEther, but can be distinguished from both by an almost straight transverse stemapodema, a rounded triangular superior volseila, and a long phallapodema, as well as by the presence of a subapical crista dorsalis of the gonostylus and by the shape of the anal point. Orthocladius (E.) ushakovskiensis sp. n. differs from all the known species of the subgenus in the absence of superior and inferior volsellae and in the shape of both short gonostylus andthe short and wide anal point.