NEUROPTEROIDEA FROM MOUNT-ST-HELENS AND MOUNT-RAINIER - DISPERSAL ANDIMMIGRATION IN VOLCANIC LANDSCAPES

Neuroptera (= Planipennia) and Raphidioptera were collected from barre n, unvegetated habitats at Mount St. Helens following the 1980 eruptio n and from summer snowfields in the alpine zone on Mount Rainier. A to tal of 291 specimens were taken in pitfall or flight traps at Mount St . Helens or hand collected from snowfields on Mount Rainier. The data represent individuals engaged in long distance dispersal flight as opp osed to local, within habitat movement. Phenological patterns of dispe rsal are detailed for species and evidence is presented for female sex bias of dispersers for several species. Taxa in four families are rep resented: 24 specimens of Coniopterygidae (Coniopteryx sp., Conwentzia californica Meinander, Semidalis sp.); 219 Hemerobiidae (Hemerobius b istrigatus Currie, H. humulinus Linnaeus, H. kokeeanus Currie, H. nead elphus Gurney, H. pacificus Banks, H. simulans Walker, H. stigma Steph ens, Micromus borealis Klimaszewski & Kevan, M. variolosus Hagen, Wesm aelius involutus (Carpenter), W. longifrons (Walker), W. nervosus (Fab ricius), W. pretiosus (Banks)); 44 Chrysopidae (Chrysopa coloradensis Banks, C. nigricornis Burmeister, C. oculata Say, Chrysoperla carnea S tephens, Eremochrysa punctinervis (McLachlan), Meleoma dolicharthra (N avas), M. emuncta (Fitch), Nothochrysa californica Banks); 4 specimens Raphidiidae (Agulla adnixa (Hagen)).