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So far, this season has proved to be productive for tabanids in New Brunswick, Canada. Using a combination of hand netting and a tent trap I have collected 21 spp. (out of 24) Chrysops, 14 spp. (out of 20) Hybomitra, and 4 (out of 8) Tabanus, no Stonemyia, Haematopota, or Atylotus.
On 23 July 2007 I visted a path through a wet spruce forest that eventually led to a sphagnum bog. There appeared to be no tabanids in the area except for 1 species of aggressive Chrysops. I set-up the tent trap across the path. In a 2.5 hour period (noon -2.30pm) I collected, from the trap, 5 Chrysops spp., 9 Hybomitra spp., and 2 Tabanus spp. I consider this a high number of species for this time of the year.
The point I am making is that some type of interceptor trap, such as a Malaise, can turn an otherwise poor day into an excellent one.