Abstract
Nilaparvata lugens (Stål) and Sogatellafurcifera (Horvath) found in light trap samples at Titi Serong Padi Experimental Station, Parit Buntar, Perak, West Malaysia, between 1972–74, were stylopised by Elenchus sp. The types of changes caused by stylopisation to the secondary and tertiary sexual organs/characters are discussed. The sex of the specimens with extremely reduced secondary sexual organs is analyzed. The development of the male secondary sexual organ from the late fifth instar to a fully developed male is traced. The reasons why the secondary sexual organs of stylopised male Delphacidae are more reduced than females are outlined.
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