Eupatorus gracilicornis Arrow,1908 Adult male of long-horned form, with a long and slender horn on the head. The yellow five-horned beetles. Male, head is black, bearing a rather long sender, sharply-pointed horn, strongly curving backwards; pronotum black, shining, bearing two pairs of thoracic horns in front and behind of both sides; scutellum densely punctured; elytra brownish-yellow except the black suture and a black narrow border at outer margin of each elytron, rather smooth and shining scutellum back and rugosely punctured. Female, without horn; pronotum is more strongly sculptured and closely rugose at sides and in front, slight shining. Length 48-70 mm. Reference http://www.siaminsectzoo.com
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