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Fly - Opacifrons maculifrons

Fly - Opacifrons maculifrons
Block Island, Washington County, Rhode Island, USA
June 6, 2016
North shore of Sachem Pond at water's edge.

Images of this individual: tag all
Fly - Opacifrons maculifrons Fly - Opacifrons maculifrons

Opacifrons maculifrons (Becker), female
ID confirmed from specimen, now a photo-voucher. Thanks Aaron.

Apparent new state record. Not recorded in (1) for RI.

Odd habitat
This is "a characteristic freshwater wrack species throughout its range" (Marshall and Langstaff 1998).

The island has many small ponds; the biggest one by far is Sachem Pond but it's fairly saline and also not particularly close to me. I don't know how far they typically disperse from their breeding grounds but there is a small, swampy pond a bit (less than 1/2 mile) to my north. There aren't any ponds within a mile to the south and east and west are ocean. What size frashwater ponds or lakes are the typical habitat?

I saw one at the edge of a large lake, large enough to have a pile of rotting debris washed up on the shore.

I just looked back through my photos and realized that I'm pretty sure this was the fly I found to be quite numerous on the north shore of Sachem Pond right at the water's edge on sand, foam, and algae (though there wasn't much of a pile of debris). I didn't take any pictures of flies from the lights until 90 minutes later. I took pictures of collected specimens in order of the location I found them (Sachem Pond then lights then Clay Head the next morning). The source of the error is probably that this was the last Sachem Pond speciemen I photographed. I'm glad I caught my error.

Moved from Flies.

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