Mosquitoes are members of the order Diptera, i.e., flies. Mosquitoes are slender, long-legged, two-winged insects that are 1/8- to 1/4-inch long. They are unlike other flies in that their wings and bodies are covered with scales, and they have long piercing and sucking mouthparts. Aedes eggs are usually black, ovoid in shape and always laid singly. When flooded or coming contact with water some eggs will hatch within a few minutes. Aedes larvae usually have a short barrel-shaped siphon. Their legs often have black and white rings. Two important species of Aedes mosquitoes are Aedes aegypti and Aedes albopictus. Both are vectors of dengue/ dengue haemorrhagic fever in Southeast Asia. Ae. aegypti breeds mainly in man-made containers such as pots, water-storage jars, empty tin cans, etc., while Ae. albopictus breeds in both natural and man-made containers. The Aedes do not deposit their eggs on water. Instead they lay them singly in areas (containers, depressions in the salt marsh or woodlands, treeholes, old tires, etc.) That will eventually be flooded by tidal actions or rains. These eggs are drought resistant and can remain viable for several years. Aedes mosquitoes are strong fliers and are known to fly many miles from their breeding sources. Life-cycle of Aedes mosquitoes from eggs to adults are rapid (as fast as 7 days), but generally between 10-12 days. Aedes mosquitoes bite mainly during dusk and dawn.