Class MYRIOPODA.

Order Chilopoda—Centipedes.

Order Chilognatha—Millepedes.

Class INSECTA.

Order Rhynchota—Imperfect metamorphoses, suctorial mouth. Bugs.

Order Thysanura—Imperfect metamorphoses. No wings. Divided tail. Spring-tails.

Order Euplexoptera—Abdomen with terminal forceps. Earwigs.

Order Thysanoptera—Four equal membranous wings. Thrips.

Order Orthoptera—Anterior wings usually shorter and firmer. Grasshoppers, &c.

Order Neuroptera—Two pairs of glassy wings—equal.