1, Lucanus cervus) and the great water-beetle (Hydrophilus piceus, fig.
Some members of this family - the large black Hydrophilus piceus (fig.
When Hydrophilus dives it carries a supply of air between the elytra and the dorsal surface of the abdomen, while air is FIG.
- Hydrophilus also entangled in the pubescence which piceus (Black Water Beetle).
That of Hydrophilus is attached to a floating leaf, and is provided with a hollow, tapering process, which projects above the surface and presumably conveys air to the enclosed eggs.
Kowalevsky or a bug is invaginated into the yolk at the head end, the portion of (1871 and 1887) on the embryology of the water-beetle Hydrophilus the blastoderm necessarily pushed in with it forming the amnion.
Heider, Die Embryonalentwicklung von Hydrophilus piceus (Jena, 1889); W.