Graduate Thesis Or Dissertation
 

The Tabanidae (Diptera) of Oregon

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/cc08hj004

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  • Fifty species and subspecies and six varieties in eight genera of the family Tabanidae are recognized from Oregon. The following genera are represented in Oregon: Apatolestes Williston, Pilimas Brennan, Stonemyia Brennan, Silvius Meigen, Chrysops Meigen, Atylotus Osten Sacken, Hybomitra Enderlein and Tabanus Linnaeus. Adults and larvae were collected from various parts of Oregon. A Malaise trap baited with carbon dioxide gas was used for the collection of adults. Materials in the collections of Oregon State University and other institutions in and outside Oregon were examined. General information on the biology and morphology of the various life stages are presented. Zoogeographical information, as given here, includes distribution and analysis of the Oregon fauna. Over 3,000 specimens were examined. A description of each species is given together with label data of examined specimens, a discussion of the taxonomy, distribution and immature stages. Difficulties were encountered with some species of Hybomitra, including H. sonomensis (Osten Sacken) and H. fulvilateralis (Macquart). The status of these species is not clear since some of the characters used in the separation of tabanid species are subject to considerable variation. This problem is discussed in the conclusion of this study and under each appropriate species. Tabanus fratellus Williston is removed from the subgenus Glaucops Zsilady and placed in the subgenus Tabanus Linnaeus, since some specimens have four annulated antennae. Hybomitra hirtula (Bigot) is treated as a full species on the basis of consistently denuded subcallus that separates it from H. tetrica (Marten). H. phaenops Osten Sacken is also treated as full species rather than as variety of H. sonomensis Osten Sacken because they differ in a number of characters.
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