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Lygaeus saxatilis
Seemed to be all red when flying but when it settled it had some black spots but was in an awkward position to photograph, wrong side of the fence on a steep bank.
Maybe 1 cm long.
Coastal marshes
Best of luck to The Bug Chicks on this first trip with Project Noah on their mission. Hopefully it will be a resounding success and that there will be more, not only in the USA but perhaps throughout the world! Here is a Spanish Bug to help you on your way.
Thanks for the English common name Malcolm! In French we call it "Punaise à damier".
Thanks for the ID Daniele, according to this site http://www.treknature.com/gallery/photo2... it is known as a Harlequin Bug. Another site calls it a Seed bug.