Grammodes moths were formerly classified in the family Noctuidae. Former noctuid moths are mostly classified in the family Erebidae now, along with all of the former members of the families Arctiidae and Lymantriidae. This reclassification has not yet met with general consensus, and many resources and publications still follow the older classification scheme (e.g.).
Wingspan ranges from 26-45mm. Body greyish brown. Fore wings with a large black patch occupying the whole wing except the basal, costal and outer area. Its outer edge waved ad joined by an oblique streak from the apex. Antemedial and postmedial lines curved inwards below the costa with whitish bands outside them on the black patch. The outer part of the postmedial band pale fulvous colored. Hind wings fuscous, with medial pale band. Cilia with white apex and anal angle.
Larva is an elongated semi-looper. Tubercles absent. Head is pale ochreous with black spots. Body with longitudinal red lines dorsally and dorso-laterally. The larvae feed on Phyllanthus, Cistus, Diospyros, Ricinus, Oryza, various grasses, Polygonum, Ziziphus and Tamarix species.
- G. g. orientalis Warren, 1913
- "Grammodes geometrica". Butterfly House. Retrieved 16 August 2016.
- Lafontaine, J. D. & Fibiger, M. 2006 Revised higher classification of the Noctuidae (Lepidoptera). Can. Entomol. 138, 610–635. doi:10.4039/N06-012
- Noctuoidea. Version 10 August 2009 (temporary) in The Tree of Life Web Project
- Hampson G. F. (1892). "The Fauna Of British India Including Ceylon And Burma Moths Vol-ii". Digital Library of India. p. 558. Retrieved 4 July 2016.[permanent dead link]
- "Grammodes geometrica Fabricius". The Moths of Borneo. Retrieved 16 August 2016.