A shaving blade was used to press slightly across the egg surface so as to make a small crack at a distance of 0.12-0.16 mm from the tip of the wider side of egg, and then pull out the embryo for examination under a microscope. The eggs laid on the papers inside ovitraps by two dengue vector mosquitoes, can be correctly identified to species, either Aedes aegypti or Aedes albopictus. The process of dissecting and a technique for the identity of the embryo larvae are presented in this paper.