Description of the third-instar of Anastrepha leptozona Hendel (Diptera: Tephritidae).

The morphology of the third-instar larva of Anastrepha leptozona Hendel is characterized using optical and scanning electron microscopy. The antennomaxillary complex, oral ridges, labium, stomal sensory organ, cephalopharyngeal skeleton, anterior and posterior spiracles and caudal segment are described and illustrated. Mature larvae of A. leptozona present a 'ventral sclerite' below the pharyngeal sclerite which is characterized for the first time in Anastrepha species.