This paper reports the detailed biological information of Taiwanese Trictenotoma formosana Kriesche, 1919 involving its natural history, life cycle, rearing technique, and observations under artificial conditions, which is the first study of Trictenotomidae. Both larval diet and adult habits are also addressed. Further life cycle observations including photographs of larval group, feeding situation of adults and larvae, the tunnel built by the larva, pupal cell and newly eclosed adult are also provided.