Eumaeinae

Eumaeinae is a subfamily of butterflies in the family Lycaenidae, commonly known as blues, coppers, and hairstreaks. This subfamily is the largest within the Lycaenidae, encompassing a wide array of species found across the globe, with a particular diversity in the Neotropics. The members of Eumaeinae are characterized by their small to medium size, with many exhibiting iridescent coloration on their upper wing surfaces.

The subfamily's taxonomic classification is subject to ongoing research, with various genera and species being re-evaluated. However, key genera often included are Eumaeus, Thecla, and Strymon. Many species within Eumaeinae are known for their rapid, erratic flight patterns. The larvae of Eumaeinae butterflies often feed on a variety of plants, including legumes, oaks, and palms, with specific host plant associations varying significantly between species and genera.

The wing undersides of Eumaeinae butterflies are typically more subdued in color than the uppersides, often displaying intricate patterns of lines, spots, and eyespots. Some species possess long, slender tail-like appendages on their hindwings, which give them the common name "hairstreaks." These tails are thought to confuse predators, mimicking antennae. The geographic distribution of Eumaeinae is extensive, with representation on every continent except Antarctica, although their highest species richness is found in the Americas.