Abstract

Most nearctic species of Tabanus of which the life history is known, require approximately a year for development from egg to adult. Only two species are known to be capable of completing the cycle during the same summer they hatch, and two others occasionally require the most of two years for completing the immature stages. Data presented herewith show variations that sometimes occur in the life histories of Tabanus atratus Fabr., T. lineola Fabr., and T. stygius Say, and the apparently definite seasonal cycles of T. sulcifrons Macq., T. lasiophthalmus Macq., T. benedictus Whit., T. trimaculatus P. de B., and T. costalis Wied.

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