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Thesis (M.S.)—University of Nebraska—Lincoln, 1951. Department of Entomology.


Copyright 1951, the author. Used by permission.


Economic importance of the Tabanidae from the viewpoint of disease transmission and direct loss to livestock is briefly reviewed.The fact that tabanids appear to be of less economic importance in Nebraska than in some other areas is pointed out.Typical life histories and biologies of tabanids are also briefly outlined.

A major portion of the paper is concerned with classification of species occurring in Nebraska.Keys to six genera and 34 species with one subspecies are given.In addition to the essential synonomy which is listed for each species, notes on distribution and identifying characteristics for each are given.

Observations on the biology of several species are included in notes under the species concerned, and the area where observations were made is described.Biological notes are primarily concerned with oviposition activity and egg masses of Chrysops aestuans Wulp, C. discalis Williston, and Tabanus punctifer Osten Sacken.

A section of the paper deals with methods used in sampling populations of Chrysops.Tanglefoot stakes were found to be the most satisfactory, indicating a population peak early in July for aestuans and discalis. The final section of the paper deals with rearing methods attempted for species of Chrysops Meigen and Tabanus Linnaeus.Literature of rearing techniques is briefly reviewed.

The table summarizes seasonal distribution of the various tabanid species in the state and indicates new records.A total of 15 new records for the state are listed; eight of these were separated from previously classified material and seven from new collections or recently published records.The appendix summarizes the state distribution of the species.

Advisor: R. E. Hill