This is one of two extant dresses bearing a Mme. Olympe label. Olympe Boisse was a French-born New Orleans dressmaker who regularly traveled to Paris to keep abreast of trend-setting French fashions of the time.such as those by Charles Frederick Worth and Emile Pingat. Mme. Olympe, as she was professionally known, initially was an importer of French goods but in time designed and sold her own garments. Her claim to fame is that, considering the date of this dress, she was one of the first, if not the first, American dressmakers to label her gowns, a practice intiated by Worth et Bobergh in the early 1860s.
Not one of our best known insect families, though possessed of classy, photogenic larvae.
From the photographer: The long projections on the head are the mouthparts and are “thought to probe for chironomid larvae in softer sediments”. They are semi-aquatic predators that have a water repellant skin. (ref Gooderham&Tsyrlin - The Waterbug Book)
Check out some of the delicate, net-winged adults (order Neuroptera) these waterside hunters grow up to be: Encyclopedia of Life