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Pesky fly - Simulium - female

Pesky fly - Simulium - Female
Loves Park 15 miles south of Wisconsin border, Winnegabo County, Illinois, USA
March 27, 2012
Size: 3 mm
I was cutting the grass and several flies buzzed around my head. They seamed to want me to swat them, but I got my net and collected them. I glued one to a tooth pick to allow me to photograph it. Were they trying to bite me?

Images of this individual: tag all
Pesky fly - Simulium - female pesky fly II - Simulium - female

Moved from ID Request.

More often Simulium flies later in the year and Prosimulium bites in early spring.

yes they were; this is a great photo of a female 'black fly'
best guess, Simulium vittatum species complex: see(1)
they feed on blood

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