Philanthaxia longicornis is a species of beetle of the family Buprestidae. It is found in China (Hainan).
Description Adults reach a length of about 6.9 mm. The dorsal and ventral surfaces are golden-green with a metallic luster.
Etymology The species is named after its morphological character of long antennae.Two New Species of the Genus Philanthaxia Deyrolle, 1864, from Hainan Province, China (Coleoptera, Buprestidae, Thomassetiini)
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