The preceding instalment under this title was published in 1945 (Can. Ent., 77: 140-144). At this time I am including the description of five species of the genus Tipula from Washington, Oregon and California, collected by Messrs. T. H. G. Aitken, Mont A. Cazier, J. A. Macnab and A. L. Melander, to whom I am greatly indebted for the privilege of studying very extensive series of Tipulidae sent by them. Except where indicated to the contrary, the types of the novelties are preserved in my collection.