Mesosemia is a genus in the butterfly family Riodinidae present only in the Neotropical ecozone. This genus rather closely approximates the preceding genus Eurybia, though it is by no means so uniform. Also here there is in most of the species almost exactly above the middle of the forewing a large eye-spot which often exhibits 2 or 3 white pupils, and where it is absent, one mostly finds yet its traces in the shape of a small central shade or minute cloud. The Mesosemia differ from the Eurybia by their smaller heads, the shorter antennae, the borders of the forewings being generally slightly curved, the short abdomen mostly not reaching as far as the anal angle, the longer hindwings being often geniculate in the middle of the distal margin, or angularly protended. The row of distal margin