雄蟲體長約45~92mm,雌蟲約40~60mm,體色為黑色,有光澤,複眼後方及前胸背板兩側有尖銳突起,雄蟲大顎個體差異變化較大,大型個體大顎為長弧形狀,前端有一個分叉與數個小齒突,基部有粗大內齒突, 中型個體大顎略似大型個體,但較寬且短,小型個體大顎只和頭部縱幅等長,內側為鋸齒狀,翅鞘明亮會反光,雌蟲體型較小,複眼後緣突起呈弧狀的三角形, 但頂角較不尖銳,前胸背板後緣兩側角內凹, 雌蟲眼緣突起為圓弧狀三角形,大顎較小。
分布在低中海拔山區,成蟲在5~10月出現,夜晚有趨光性,會到有光的地方活動,為台灣特有種。 成蟲以植物汁液及水分為生,常出現在柑橘樹上吸食汁液,幼蟲寄居在枯木根部,蛀食木頭。
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