The circled egg was later dislodged from the leaf. I kept it separate from the rest of the egg mass and photographed the larva that emerged every day, providing a complete record of the larval instars of a single individual.
I don't know what species the leafhopper nymph is. Many of these flightless early instars were on the tree, and the eggs were probably laid there to take advantage of the food source.
Plant: Maple, Acer
sp. The tree was a small, bushy sapling, under 5 feet (1.6 m) tall.
(For life cycle photos of another lady beetle species collected from the same tree, start here: http://bugguide.net/node/view/309934