Wednesday, July 24, 2019

July 17, 2019: Black Fly

I was crossing the bridge between the north and south lakes when I spotted a large black fly that had landed on the bridge railing.  I had never seen a fly this big before, it was over 1" in length.  Black Horse Flies (Tabanus atratus) range from Washington southeast through Idaho, Utah, and Texas, and eastward, including Ontario and Quebec.  Females are blood-feeders on horses and cattle, while males may be found on flowers. (Wolf. Oesterreich, 7/10/19)

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