| | Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae |
Euchloris.
Adults. Antennae of males bipectinate; apically simple. Face smooth.
Wingspan 33–35 mm. Forewings 1.5–1.7 times as long as wide. The outer margin of the forewing convexly curved to more or less straight. Forewings green; with a clear discal mark (this white). Hindwings plain; green; predominantly green when fresh; with a clear discal mark (white, proximally paler), or without a clear discal mark; transversely lined (with a white terminal line).
Vein 10 of the forewings arising out of vein 9. Hindwings exhibiting a tubular vein 5. Vein 5 of the hindwings arising from well above the middle of the transverse vein. Vein 8 of the hindwings shortly anastomosed basally with the upper margin of the cell, thence rapidly diverging. Hindwing veins 6 and 7 stalked.
Posterior tibiae of males 4-spurred.
Early stages. Larvae feeding on Artemisia, disguising themselves with attached fragments of the food-plant.
British representation. 1 species; South-east England. Living adults found in July. T. smaragdaria maritima (Essex Emerald, subspecies perhaps extinct).
Subfamily. Geometrinae.
Illustrations. • Geometrinae: Thetidia smaragdaria (Essex Emerald Moth: B. Ent. 300). • Geometrinae: Thetidia smaragdaria: B. Ent. 300, legend+text. • Geometrinae: Thetidia smaragdaria: B. Ent. 300, text cont.. • Geometrinae: Newman (1869). 1, Aplasta ononaria (The Rest Harrow); 2, Pseudoterpna pruinata (Grass Emerald); 3, Comibaena bajularia (Blotched Emerald); 4, Geometra papilionaria (Large Emerald); 5, Thetidia smaragdaria (Essex Emerald); 6, Jodis lactearia (Little Emerald); 7, Chlorissa viridata (Small Grass Emerald); 8, Hemistola chrysoprasaria (Small Emerald); 9, Hemithea aestivaria (Common Emerald). From Newman (1869).
We advise against extracting comparative information from the descriptions. This is much more easily achieved using the DELTA data files or the interactive key, which allows access to the character list, illustrations, full and partial descriptions, diagnostic descriptions, differences and similarities between taxa, lists of taxa exhibiting or lacking specified attributes, and distributions of character states within any set of taxa. See also Guidelines for using data taken from Web publications.
Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae. Version: 14th February 2021. delta-intkey.com’.
