March Fly from Canada

Subject:  Black-orange bug
Geographic location of the bug:  New Brunswick, Canada
Date: 06/03/2019
Time: 10:27 AM EDT
Your letter to the bugman:  Hello,
On May 31st 2019 I have found a large number of these strange bugs appearing here in New Brunswick, Canada and also in Maine, USA. They do not seem to harm anything. I have seen them in clusters of over 1,000. They are fly like and have orange and black segmented legs. Wings have markings. The antennae are very short, maybe around 2mm. I have looked all over the internet at thousands of bugs and can not find anything anywhere. Any help would be appreciated.
How you want your letter signed:  JP

March Fly

Dear JP,
This is a March Fly in the family Bibionidae, and during mating season, there may be great numbers of adults emerging and mating, and then vanishing as quickly as they appeared.  We believe your individual might be a female
Bibio xanthopus, and you can see an image of a sexually dimorphic male which has much larger eyes pictured on BugGuide.

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