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This study gives out the identification of insect faunal waves colonizing decomposing carrions of rabbits and guinea pigs treated with certain drug agent (tramadol) in Cairo, Egypt. Each of six rabbits and six guinea pigs is divided into 2 groups, where the first was killed by tramadol and the second group was killed by asphyxia as a control experiment. Generally, decomposition process was observed to have a slower rate in winter. Reaching to the skeletal stage was delayed in tramadolintoxicated carcasses in comparing to the control carcasses. A total of 12966 arthropod individuals (Immature stages and adults) were collected. In concern of class Insecta, 67 species belonging to 6 Insecta orders and 2 Arachnida orders, 37 families and 51 genera were identified from this study during winter and summer seasons. Significantly lower numbers of immatures were observed and collected in the present study from the treated carcasses. The proportions of adult insects were also significantly different in control carcasses when compared with tramadol intoxicated ones in both winter and summer season for both rabbits and guinea pigs. This study provides background for the influence of tramadol on the colonizing wave of arthropod fauna which is of relevance to forensic science. We can conclude that drugs and toxins present in a decomposing body may alter the rate of insect invasion of that body.

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Background: In the current study, 23 species within 18 genera and 13 families of order Diptera were taxonomically studied. These members were collected from, on, in, around and beneath the carcasses of rabbits and guinea pigs. Results: The families which collected from the carcasses are as follows: Agromyzidae (one subfamily, one genus and only one species), Calliphoridae (three subfamilies, three genera and sex species), Dolichopodidae (one subfamily, one genus and only one species), Drosophilidae (one subfamily, one genus and only one species), Ephydridae (one subfamily, one genus and only one species), Fanniidae (one genus and only one species), Muscidae (two subfamilies, three genus and four species), Phoridae (one subfamily, one genus and only one species), Piophilidae (one subfamily, one genus and only one species), Psychodidae (one subfamily, one genus and only one species), Sarcophagidae (two subfamilies, two genera and three species), Sphaeroceridae (one subfamily, one genus and only one species), and finally Ulidiidae (one subfamily, one genus and only one species). Only seven of which (Calliphoridae, Fanniidae, Muscidae, Phoridae, Piophilidae, Sarcophagidae and Ulidiidae) are of forensic importance or necrophagous. Other families are the following: Drosophilidae, Psychodidae, Agromyzidae, Dolichopodidae, Ephydridae, and Sphaeroceridae are of minor importance as forensic indicators. Conclusions: Taxonomic keys for the adults which collected from the carcasses were constructed. Also diagnosis, synonyms, photographs and the forensic importance for the taxa were provided.

The present work was carried out to make a pilot study of mantis population using mark release recapture technique in El-Fayoum governorate through the year of 2008 to estimate the population density and the biodiversity of some mantis fauna. This study form a nucleus of more extensive studies on mantis ecology which is still not clear and shed the light on the nature of mantis population and some problems facing this beautiful insect in Egypt.