Abstract
SUMMARY The results of preliminary studies of fertilisation in Telmatoscopus albipunctatus (Williston) (Diptera Psychodidae) are described. In this species the spermatheca is missing, consequently the sperms are injected deeply into the female apparatus during mating. The sperms are immotile and devoid also of the accessory structure which substitute the flagellar complex; they are even unable to acquire motility after chemical treatment. The eggs are, however, normal; in fact, they are provided with common inclusions, a normally constituted chorion and a micropyle like a corolla of petal-shaped platelets. Probably the sperms reach the micropyle as a results of the activity of the slender filaments present near it.
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