Six new species of Cryptochironomus Kieffer (Diptera, Chironomidae) from the Nearctic region.

Six new species of Cryptochironomus Kieffer, 1918, C.absum Liu, sp. nov. , C.beardi Liu, sp. nov. , C.dentatus Liu, sp. nov. , C.ferringtoni Liu, sp. nov. , C.parallelus Liu, sp. nov. and C.taylorensis Liu, sp. nov. , are described and illustrated based on adult males. The specimens were collected from various water systems in the United States and preserved by Dr. Leonard Charles Ferrington Jr. An updated key to adult males of all known Cryptochironomus species in the Nearctic region is also provided.