The tiny hemipterans are nymphs of a lacebug, family Tingidae. The image with multiple individuals is a collection of shed exoskeletons left behind after molting:- (lace bug exuvia. [ex·u·vi·ae] Pronunciation [ig-zoo-vee-ee, ik-soo-] – plural noun the cast skins, shells, or other coverings of animals.) Many insects seem to have synchronous molts like this.

If they are observed on birch, they're either Corythucha heidemanni or Corythucha pallipes.

Lacebugs belong to the insect order Hemiptera, or "true bugs," and all species are grouped in the Hemipteran family, Tingidae. Their common name comes from the lacy-like venation of the broad, flat, whitish colored forewings that cover most of the insects body.
As with all Hemipterans, lace bugs feed using sucking mouthparts. Most lace bugs feed on the underside of leaves, but symptoms appear on the upper leaf surface. Damage symptoms first appear as small yellow spots, or stippling. The spots may coalesce cause leaves to become bronze colored, which superficially resembles spider mite feeding damage.

Many thanks to Laura Miller (a leading authority on lacebugs), Eric Eaton from Bug Guide, and Daniel Marlos from What's That Bug for all all their assistance in the proper identification and information above, of these insects.

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