| Calosoma maximoviczi Morawitz belongs to Calosoma Web, Carabidae, Coleoptrra. The beetle distributes in Korea, Japan, far east area of Russia and most places in our country. It mainly preys on many kinds of Lepidoptera larvae and other farming and forestry pests, such as the larvae of scarabaeoidea and Muscidae etc. It is very useful because of its good adaptability, wide distribution, and resourceful abundance. In this paper, biology and adult artificial diet were studied under the condition of laboratry and field. The results as follows:1 Main biologyIt occoured one genetation per year in Shandong province and overwintered as adult in soil. Adult beetle emerged from mid-May to the first ten days of October, and oviposited in early June. The developmental threshold temperature of egg was 14.66±0.5℃, and its effective accumulated temperature was 41.7±20.85 degree-day. At 25℃, eggs hatched after 3.69±0.25 days, the nymph had three instars, the 1st instar stage was 3～5 days, 2nd instar 3～5days, and 3rd instar 4～5 days; The prepupal stage lasted 8～14 days and the pupal stage lasted 10～15 days at 25℃. Adults and larva preyed on many kinds of Lepidoptera larvae. Antennas played the most important role in seaching prey, and compound eyes played the secondary importance. Besides, seaching prey may be assisted by maxillary and maxillary palpi, labial and labial palpi which maybe have some olfaction fuction.2 Study on adult artificial diets9 kinds of artificial diets were designed, among them dietⅢwas the best one, and the results as follows:(1) Selection of physical property of artificial dietMushy diet was the best.
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