The weather is perfect: sunny, bit of a breeze, in the high 70's. This opposite leaved dogwood tree in my backyard always has several insects or spiders on its leaves at any one time. Sawflies will almost decimate the leaves by summer's end. At the base of many petioles, an insect had put spittle. Lower leaves had almost circular holes, around a 1/4". This insect barely moved. What struck me when I downloaded images was the almost blob-like, tentacle knob where the wings meet. Maybe it's part of this insect, I don't know.