In Egypt, family Scarabaeidae comprises several representative species more or less injurious to fruit trees and field sops in newly re-claimed areas. In recent years, the population of Tropinota suctalida out‌breaked and caused great damage to various plantations. The following points were taken into consideration. Anatomy of T. sousaida male and female reproductive system was car-ried out and the results as follows: a- The female reproductive system consisted of a pair of ovaries, oath ovary consisted of 8 ovarioles, lateral oviduct and a median oviduct, va-gina, spermatheca, sperrnathecal glands. bursa copultrix and an oviposi-tor. b- The male reproductive system consisted of a pair of testes. two vasa defemtia with vosicula seminal, a pair of accessory gland with reservoirs and ducts ejaculators. Each testis consisted of eight separate follicles connected by long vase deferentia to vas deference. c- The testis areas of males captured in traps were significantly bigger than those newly emerged in laboratory or non-copulated with females. Three peaks of testes areas were recorded during March and April 1997 and 1998. On the other hand, male catch which captures emerged early recorded the least testes areas. This might be due to that most emerged males did not find females, where the sex ratio at this period was males biased. d- Ten females were dissected weekly from the catch during third week of February until mid-April, 1997 & 1998 seasons and found that: 1- Most of attracted females were copulated before capturing and traps captured copulated females more than non-coputated ones. 2- Percentage of mature eggs of trapped dissected females were less than that immature and it increased only during the first two weeks. These results helped in predicting the number of eggs deposited accord‌ing to emergence and capturing dates. Therefore, traps could play an important role to suppress the population density and reduce (directly or indirectly) injuries of insects specialty if these were distributed in the early season (January — February). `