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Abstract
In lst-instar larvae of Aedes aegypti the proventriculus is covered by a thin undifferentiated cuticle. In the 2nd instar there is usually a sclerotized band of cuticle around the proventriculus. In the 3rd instar about 80% of the individuals develop 2 circumferential flanges at the band. In the 4th instar all individuals develop 2 flanges and the band of cuticle in this area becomes thickened. There is some variation in both structure and degree of sclerotization within instars and between strains. The bands and flanges are formed by 2 adjacent rings of 1.5 to 2 dozen cells each. These rings of cells first form a circumferential protrusion of cytoplasm the size of the future flange. This secretes an epicuticular mold for the flange. Secretion of procuticle fills this mold, and further secretion forms band under the flanges. The functional significance of this differentiation of the proventriculus is discussed.
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