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Plant cells have diverse chemical compositions (Steward and Sutcliffe 1959). Plant sap sucking insects feed selectively on different parts of plants. In corres pondence, there is modification of the alimentary canal to deal with the specific type of plant sap imbibed (see reviews by Wigglesworth 1972, Richards and Davis 1977). Homopteran insects that feed on xylem sap have a very specialised filter chamber for dealing with the dilute ingesta that is rich in water and mineral contents (Cheung and Marshall 1973, Marshall and Cheung 1974). On the other hand, phloem feeders such as Eurymela distincta have also a distinct filter chamber adapted for short-circuiting excess sugars and water (Lindsay and Marshall 1980). In mesophyll feeders, however, there is generally lack of a filter chamber (Goodchild 1966). The lantern bug Pyrops (Fulgora) candelaria feeds selectively on cambium sap (Marshall and Cheung 1975, Cheung 1979, 1981). The alimentary canal is modified to have a midgut sheath (intestine sheath) surrounding the long coiled midgut (Cheung 1981, Cheung and Marshall 1982). The ultrastructure of this midgut sheath and also the anterior diverticulum has not been previously reported. Histological investigations of the midgut sheath and the anterior diverticulum of Pyrops tenebrosus were first reported by Goodchild in 1963. He postulated that this sheath acts as a barrier to safeguard the haemolymph from being diluted by the imbibed plant sap. A detailed study on the fine structure of the midgut sheath and the anterior di verticulum may give useful informations on the functions of these structures.

cytologia

Light and electron microscopic observations of the midgut sheath and anterior diverticulum of the lantern bug, Pyrops candelaria Linn. ( Homoptera: Fulgoridae)