Note 4 — Chapter XII · THE WHITE-FACED DECTICUS: THE LAYING AND THE HATCHING OF THE EGGS

The head is very much bent against the chest. With its big, black ocular specks and its undecided and rather bloated mask, it suggests a diver’s helmet. The neck opens wide at the back and, with a slow throbbing, by turns swells and subsides. That is the motor. The new-born insect moves along with the aid of its occipital hernia. When uninflated, the fore-part pushes back the damp sand a little way and slips into it by digging a tiny pit; then, blown out, it becomes a knob, which moulds itself and finds a support in the depression obtained. Then the rear-end contracts; and this gives a step forward. Each thrust of the locomotive blister means nearly a millimetre4 traversed.