Abundance and Seasonal Distribution of the Tabanidae (Diptera) of the Great Swamp, New Jersey1

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Abstract
Collections of Tabanidae in Great Swamp National Wildlife Refuge, a hardwood swamp in north-central New Jersey, yielded 6471 specimens representing 33 species—16 in Chrysops, 11 in Tabanus, and 6 in Hybomitra. The flies were collected by net, vehicle, and modified versions of 2 previously described traps. In routine collections made 3 times weekly for most of the period from May 6 through September 9, T. lincola F. and C. vittatus Wiedemann were shown to be the dominant tabanids in this area, as they constituted 46% of the material collected. Two distinctive types of seasonal distributions were represented in each genus, by (1) abundant species which increased rapidly to peak numbers, then declined at varying rates but always more slowly than they increased—e.g., C. vittatus, T. lincola, and H. lasiophthalma (Macquart) ; and (2) common species found throughout the season in small numbers—e.g., C. univittatus Macquart, T. sparus var. milleri Whitney, and H. epistates (Osten Sacken). The distributions of C. dimmocki Hine, C. frigidus Osten Sacken, C. macquarti Philip, C. sackeni Hine, and H. hinei hinei (Johnson) did not conform to either of these types; they had either a shorter season, or a slower rate of increase or decline, or both.

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