10.22376/ijpbs.2019.10.1.p1-12 Volume 6 Issue 1 2015 (January - March) The present study revealed the basic structure of salivary gland of third instar larvae of lessThan i greaterThan Chrysomya megacephala lessThan /i greaterThan in order to clarify the source of proteolytic enzymes in the excretory/secretory products of this maggot. The salivary gland of third instar larvae of lessThan i greaterThan Chrysomya megacephala lessThan /i greaterThan possess very well-developed cuticle, numerous rough endoplasmic reticulum with different shapes. Secretory products were observed beneath the cuticle. A large nucleus was observed nearly in the middle of the cell. Very well-developed musculature was seen throughout the cell. Numerous tracheae, mitochondria and other organelles were present throughout the cell. Thin basement membrane was observed with well-developed basal labyrinth that encloses numerous mitochondria. The structure of salivary gland cell of third instars larvae of lessThan i greaterThan Chrysomya megacephala lessThan /i greaterThan indicate that salivary gland is responsible for a great part on the production of most of enzymes in the excretory/secretory products of this maggot. NANCY TAHA MOHAMED, PHD Chrysomya megacephala, Maggots,Proteases,Salivary gland 1220-1228