Narycius opalus is a flower chafer beetle that is endemic to the Western Ghats of India. It is the sole species in the genus. The adult male has a prominent projection on the head, while the female has a much shorter horn. This structure is probably the result of sexual selection, as in similar beetles. The adult beetle is shiny iridescent rose ranging to green, with intermediates.
This beetle is about 2 to 2.5 cm long and 1.3 cm wide. The distinctive cephalic horns may be nearly two-thirds the length of the thorax and abdomen combined. The surface is matt and the elytra are minutely pitted along lines. The prothorax and scutellum have pits that are irregularly placed. The upper edges of the cephalic horn are nearly straight and parallel and the expand towards the end and the tips are inwardly curving. The prothorax is convex above and is broadest at the middle. The female has a much shorter cephalic horn.
The species has been noted from Coorg, Wynaad, the Nilgiris and Travancore.
- Westwood, JO (1845) Arcana Entomologica Vol.1. William Smith, London
- Arrow, GJ (1910). The Fauna of British India. Coleoptera. Lamellicornia (Cetoniinae & Dynastinae). Taylor and Francis, London. pp. 70–71.
- Arrow, G. J. 1935. A note on the genus Narycius and a few other genera of Cetoniid Coleoptera. Stylops 4: 101.
- Arrow, G. J. 1948. A note on the Indian beetle genus Narycius. The Annals and Magazine of Natural History (12) 1: 71-72.
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