Arvalis Ross, S. Californica Banks, S. Cornuta Ross, S. Hamata Ross, S
AN ABSTRACT OF THE THESIS OF ELWIN D. EVANS for the DOCTOR OF PHILOSOPHY (Name) (Degree) in ENTOMOLOGY presented on October 4, 1971 (Major) (Date) Title: A STUDY OF THE MEGALOPTERA OF THE PACIFIC COASTAL REGION ,Or THE UNtjT5D STATES Abstract approved: N. H. /Anderson Nineteen species of Megaloptera occurring in the western United States and Canada were studied.In the Sialidae, the larvae of Sialis arvalis Ross, S. californica Banks, S. cornuta Ross, S. hamata Ross, S. nevadensis Davis, S. occidens Ross and S. rotunda Banks are described with a key for their identification.The female of S. arvalis is described for the first time.Descriptions of the egg masses, hatching, and the egg bursters and first instar larvae are givenfor some species.Data are given on larval habitats, life cycles, distribution and emergence of the adults. An evolutionaryscheme for the Sialidae in the study area and the world genera ishypothesized. In the Corydalidae, Orohermes gen. nov. andProtochauliodes cascadiusse.nov. are described.The adults of Corydalus cognatus Hagen, Dysmicohermes disjunctus Munroe, D. ingens Chandler, Orohermes crepusculus (Chandler), Neohermesfilicornis (Banks), N. californicus (Walker), Protochauliodes aridus Maddux, P. spenceri Munroe, P. montivagus.Chandler, P. simplus Chandler, and P. minimus (Davis) are also described.The larvae of all but three species are described.Keys are presented for identifying the adults and larvae.Egg masses, egg bursters and the mating behavior are given for some species.Pre-genital scent glands were found in the males of the Corydalidae.Data are given on the larval habitats, distribution and adult emergence.Life cycles of five years are estimated for some intermittent stream inhabitants and the cold stream species, 0.
[Show full text]