Descriptions, illustrations and habitat characteristics are given for the previously unknown larvae and pupae of Tipula (Arctotipula) hovsgolensis T. (A.) caliginosa and T. (A.) quadriloba and pupae of T. (A.) salicetorum. In addition the larval stage of Tipula (A.) conjuncta conjuncta is redescribed. For the first time in Tipula (Arctotipula) microscopic hairs on the abdomen, length of the abdominal tubercles, length of the lateral abdominal setae, the arrangement of hairs on the spiracular lobes and the sclerotisation of spiracular field are discovered as the main characters to distinguish the larvae. Pupae of this subgenus can be separated by the shape and arrangement of the spines on the terminal segments. Larvae of most these species develop on the benthic and riparial zones of Mongolian rivers and springs; a few develop in marshy meadows.