CATERPILLARS. Pine-tree moth cocoon Ichneumon-fly larva syrphus- willow- 1907'1. (1) Exenterus marginatorus attacking the larva of the pine tree moth; (2) The cocoon of the latter as left by an Ichneumon fly; (3) As left by its rightful occupant; (4) Bassus albosignatus attacking the larva of the syrphus fly; (5) Male of the same; (6) Banchus falcator stealing upon a caterpillar; (7) Larva of the ichneumon fly; 2. Anomalon circumflexum attacking a caterpillar; and Ophion undulatus thrusting its ovipositor into the body of a