| | Insects of Britain and Ireland: the genera of Lepidoptera-Geometridae |
Chlorochroma.
Adults. Antennae of males bipectinate; bipectinate to the apex.
Wingspan 33–39 mm. Forewings 1.6–1.9 times as long as wide. The outer margin of the forewing convexly curved. Forewings green; without a clear discal mark. The outer margin of the hindwings angled (with two points); scalloped (but with one conspicuous bite only). Hindwings conspicuously patterned; green; predominantly green when fresh; without a clear discal mark; transversely lined (with a contrasty, light second line and a terminal one).
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 2-spurred (likewise in the female).
Early stages. Larvae feeding on Achillea.
British representation. 1 species; Central-southern England, or South-west England (first recorded in 1902, and rarely seen). Living adults found July and August. T. fimbrialis (Sussex Emerald).
Subfamily. Geometrinae.
Illustrations. • Geometrinae (‘Emeralds’): Kirby 44 (part). GEOMETRINAE. 12, Aplasta ononaria (Rest Harrow); 13, Chlorissa viridata (Small Grass Emerald); 14, Pseudoterpna pruinata (Grass Emerald); 15, Geometra papilionaria (Large Emerald); 16, Jodis lactearia (Small Emerald); 17, Comibaena bajularia (Blotched Emerald); 18, Thetidea smaragdaria (Essex Emerald); 19, Hemithea aestivaria (Common Emerald); 20, Thalera fimbrialis (Sussex Emerald); 21, Jodis lactearia (Little Emerald).
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’.
