Abstract
The egg-batches of Tabanus chrysurinus (Enderlein, 1925) were collected from more or less shaded swamps in or at the margin of forest. The eggs were laid on the underside of leaves of 6 kinds of plants, mainly Phragmites communis Trinius, at the average height of 84.5cm above the ground. The egg-batches were light yellow, and nearly conical in shape with 3 to 4 layers of eggs. Average number of eggs per batch was 525. Seven batches out of nine unhatched ones were parasitized by wasps (Telenomus angustatus). Morphological differences of the egg-batches among closely related 3 species, T. katoi, T. sapporoenus and T. chrysurinus, were interpreted.
