A Text-book of Entomology / Including the Anatomy, Physiology, Embryology and Metamorphoses of Insects for Use in Agricultural and Technical Schools and Colleges as Well as by the Working Entomologist

by A. S. Packard

—— Nachtrag zu den Untersuchungen über den Bau des Gehirns und der Retina der Arthropoden. (Ibid., Heft 3.)

Viallanes, H. Recherches sur l’histologie des insectes, etc. Paris, 1882. (Annales des Sciences nat., pp. 1–348, Pls. 1–18.)

—— Sur la structure de la substance ponctuée des insectes. Paris, 1885.

Haller, B. Ueber die sogenannte Leydig’sche Punktsubstantz im Centralnervensystem. (Morp. Jahrb., xi, 1886.)

Nansen, F. The structure and combination of the histological elements of the central nervous system. (Bergen’s Museum Aarsberetning for 1886. Bergen, 1887.)

Also the writings of Benedicenti, Holmgren.

THE SENSORY ORGANS

a. The eyes and insect vision

Fig. 259.—Different forms of compound eyes. A, a bug (Pyrrhocoris). B, worker bee. C, drone. D, male Bibio, a holoptic insect.—From Judeich and Nitsche.