Fig. 1. Electron micrographs of antennae of male Eriocrania semipurpurella. (A) Scanning electron micrograph showing two sensilla auricillica (arrows) and sockets from dislodged scales (arrowheads). The short hairs present on the antennal surface are non-innervated cuticular structures (compare C). Scale bar, 5 µm. (B) In addition to the auricillic sensilla, trichoid sensilla (arrows) occur basally on the flagellomeres. Stout chaetic sensilla (arrowhead) are found on the distal parts of the flagellomeres. Scale bar, 10 µm. (C) Transmission electron micrograph showing a transverse section of sensilla above the antennal surface (bottom) of a male E. semipurpurella. The auricillic sensillum (au) contains numerous branches of the dendritic outer segments, whereas the trichoid sensilla (tr) have moderately branched dendritic outer segments. Non-innervated hairs (arrowheads) are present between the sensilla. Scale bar, 1 µm.