Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
A systematic study of the family Boreidae (Mecoptera)
By Penny, Norman D.
University of Kansas Science Bulletin 51: 141-217, 1977
Cite: 737774 with citation markup [cite:737774]
Available as PDF at (1).

Note that several species have been described since this publication. This is still probably the most complete work on the group.