Анотація:
A key to 11 holarctic species, including four described species as new: Brevicornu cristatum sp. n. (type locality: Barton Flat, California, U.S.A.), B. subfissicauda sp. n. (type locality: New York, Sacandaga Park, U.S.A.) B. hissaricum sp. n. (type locality: Dushanbe, Gulbista river valley), B. californiense sp. n. (type locality: Mono Co., California, U.S.A.). New distributional data are given.