ABSTRACT
The mid-gut of third instar larvae of Sarcophag aegyptiaca was divided into anterior, middle and posterior mid-gut regions. A well-developed peritrophic membrane appeared in the apical part of the anterior and middle portions of mid-gut while it is absent from the posterior portion. The microvilli differs in 3 portions, appeared as apical membrane in the anterior portion, sparse in middle portion to long slender compact microvilli in posterior portion. Numerous organelles were observed throughout the cytoplasm of the 3 portions; lipid spheres, rough endoplasmic reticulum, seceretory vesicles and mitochondria. A large apically nucleus appeared in the 3 portion of mid-gut. A basal labyrinth was observed in both anterior and posterior regions of mid-gut while it was absent in middle portion of mid-gut. Thin basement membrane was observed in the 3 portions of mid-gut of third instar larvae of Sarcophag aegyptiaca.