Macrophotograph of a female yellow fever mosquito, Aedes aegypti, feeding on a human arm. The labium, the protective sheath of the proboscis, arches backward out of the way to allow the piercing and sucking stylets to enter the skin. The female yellow fever mosquito is the carrier of an arbovirus, which causes the yellow fever disease, a once fatal & pervasive infection that is still dangerous in parts of tropical Africa and Central & South America. Magnification: x3 at 35mm size.