Abstract
The histology of the developing Brindley's gland of adult Rhodnius is described. The presumptive epithelium from which the gland will develop is distinguishable on the 4th day after feeding the fifth instar by its intense stainability. The epithelium thickens and lengthens through rapid mitosis resulting in a hollow, thick-walled sac with a short duct. The duct cells become distinguishable first, then glandular epithelium and the saccules and eventually the secretory apparatus of the secretory cells. Mitosis continues, at a decreasing rate, until the 20th day after feeding, somewhat later than it would occur in the surrounding integument. Just prior to ecdysis the type A glandular units are indistinguishable from those of the adult; however, the type B units appear somewhat less completely developed.
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