Abstract: evelopmental rate, survival and age-specific fecundity of Cyrtorhinus lividipennis (REUTER), an important egg predator of the rice planthoppers, fed on eggs of white-backed planthopper (Sogatella furcifera Horvath), were determinedunder various constant temperatures from 17℃-33℃ and with different food. The developmental rate curve of this predator is in the shape of a sigmoid. The deve lopmental threshold and thermal constant were estimated to be 9.83℃ and 359.05day-degree, respectively. The generation survival (Y₁), the intrinsic rate of capacity of increase(Y₂) ,nd the total eggs laid per female (Y₁)were higher at 21℃-29℃, which can be described by following equations, Y₁= exp(-3.0031+0.5223X-0.0105X²), Y₂= -0.5971+0.0535X-0.0010X₂,and Y₃= exp(-12.0791+l.3869X-0.0278X²), whereX is the temperature in ℃. The optimum temperature for the population growth is 26.00℃ with a maximum finite rate of increase of 1.1044.On average, the number of eggs laid per female are 247.63±74.73, 237.25±18.62, 196.83±69.08 and 128.14±81.29, when fed with BPH egg, WBPH egg, BPHyoung nymph and WBPH young nymph, respectively. However, the developmental rate and longevity are not significantly affected by these prey. Egg hatchability is 59.83, 58.26, 44.35, and 46.96, respectively. Therefore, BPH egg is the best food of Cyrtorhinus lividipennis.

Key words: Cyrtorhinus lividipennis——temperature——food——intrinsic rate of capacity of increase——finite rate of increase