Tribe Hydriomenini Meyrick, 1872 (Figs 95–97) The tribe is discussed here as delimited by Herbulot (1962). The tribe is composite in the treatment by Forbes (1948), and Ferguson (1983) when characterized as: front sloped and tufted or thickly scaled below; metathorax strongly tufted; the upper discocellular bent in hind wing and M2 closer to M3 than M1. Herbulot (1961-1963) moved Mesoleuca Hübner and Entephria Stephens from Hydriomenini s. l. to Larentiini, other genera to Cidariini, Perizomini and Rheumapterini and restricted Hydriomenini for the nominate genus. McDunnough (1954), dealing with Nearctic species of the genus Hydriomena Hübner listed its characters as follows: specific shape of uncus, flat, bifurcate or dilated apically; modifications on costal region of valva (tubercles, bearing single stiff, curved seta („ribbon”) and locks of specialized hairscales); large, sparsely setose plate of juxta with dorsoapical papillae in male; membranous bursa copulatrix almost without signa but with heavily sclerotized ductus bursae, and semiglobular chitinous digitabulum attached to the latter in female; hemitranstillae connections to juxta membranous; manica rugose, not spiny. The presence of a long costal or subcostal hair lock is shared, although less complicated, by Larentiini, Stamnodini and some Neotropical genera not assigned to tribes. The digitabulum to the female bursa seems to be characteristic to the species from the northern hemispheric (Figs in McDunnough 1954). Distribution: Neotropical, Nearctic, (Palaearctic).

Published as part of Viidalepp, Jaan, 2011, A morphological review of tribes in Larentiinae (Lepidoptera: Geometridae), pp. 1-44 in Zootaxa 3136 on pages 27-28, DOI: 10.5281/zenodo.279481