Archive image from page 25 of Dermaptera (Earwigs) (1910). Dermaptera (Earwigs) dermapteraearwig00burr Year: 1910 4 INTBODUCTION. The corresponding ventral plates form the pro-, meso- and metasUrna. The prosternum is a longitudinal plate, generally more or less parallel-sided, with a ccmstriction near the base, but occasionally angustate or narrowed posteriorly ; this constriction admits the insertion of the anterior pair of legs. The mesosternmn is a plate of irregular outline, usually about as broad as long, with sinuate sides to admit the middle pair of legs; the hinder margin extends some
Archive image from page 25 of Dermaptera (Earwigs) (1910). Dermaptera (Earwigs) dermapteraearwig00burr Year: 1910 4 INTBODUCTION. The corresponding ventral plates form the pro-, meso- and metasUrna. The prosternum is a longitudinal plate, generally more or less parallel-sided, with a ccmstriction near the base, but occasionally angustate or narrowed posteriorly ; this constriction admits the insertion of the anterior pair of legs. The mesosternmn is a plate of irregular outline, usually about as broad as long, with sinuate sides to admit the middle pair of legs; the hinder margin extends somewhat beyond the middle coxae, and is truncate, or more or less rounded; the relative width of this intercoxal portion is the expression of the breadth or slenderness of the insect. Wings. Glandular folds or stink-glands. Abdomen. •-' First tarsal segment. ' Second tarsal segment. '' T hird tarsal segment. -- Pulvillus. -- Claws. - Antenna. Frons. Frontal suture. Occiput. Median suture. Prozona. Suture. Metazona. Shoulder. Scutellum. Sutural margin. Costal margin. Posterior margin. Posterior femur. Posterior tibia. Posterior tarsus. Last dorsal segment. Pygidium. Forceps. Fig. 1.—Diagram of dorsal aspect of an Earwig. The metasternum is of the same general shape as the meso- sternum, but is larger, in order to carry the hinder or largest pair of legs; its maximum breadth is in the anterior portion, and it is strongly narrowed behind by the emargination of the sides so that the posterior portion forms a relatively narrow lobe which generally extends beyond the coxae ; the shape of this lobe affords useful characters: its posterior margin may be truncate, sinuate
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