Morphological, biological and ecological characteristics of A. Grandis have been identified in this study. Obtained results showed thats, its egg is spherical shape, gray-white, then gray-brown, with an average diameter of 2±0.2mm. Nymphal stage is white to the end of 3rd nymphal instars is brownish yellow. The average of body length and width of the 1st nymphal instars, the 2nd instars, and the 3rd instarsis are 17mm and 3±25mm, 27mm and 5±5mm, and 41±5mm and 7±5mm, respectively. The average body length of pupae is 26±5 mm, and the width average is 8 mm. Adult females are larger than adult males, with the average body length, and the average
width of female adult are 50mm, and 15 mm, respectively, while the average body length and the width of male adult are 39±5 mm, and 12±5 mm, respectively. The adult s are active at night, while the larvae act mainly in during the day time. Rotten wood is most favourit food for both lavae and adults. The suitable conditions for A. grandis devolopment are a cool temprature, high humidity, and often resides in stems and stumps of rotten plants, especially in the bark of the tree. This study also showed that each female could lay from 24 to 36 eggs, the average of 30.9 eggs per female, and the sex ratio of female and male in pupae was 1.0 1.18. The average development period of eggs, larvae, pupae, and adult in different environmental conditions was 18; 61; 16 and 27 days, respectively. The lifespan of the adults was very high, ranged from 50 to 71 days, and at lower temperatures in summer, the higher the lifespan was. The rate of developing completion from eggs to adults at the different conditions was from 45.83% to 48.8%.