Lace bugs (Hemiptera: Tingidae) are some of the tiniest, most delicate creatures I observe on a regular basis. Only a few millimeters in length, the individual shown here was dwarfed by the whorls of my thumb.
Although small some of these insects are capable of doing significant harm to their host plants. Most feed on trees, and a few species are serious pests. They use their piercing-sucking mouthparts to drain the fluids from leaves, causing them to brown and die. In large groups they’re capable of causing substantial defoliation.