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The prothorax of the honey-bee.

Honey Bee

The prothorax of the honey-bee.

The Saw-Toothed Grain Beetle (Oryzaephilus surinamensis) is a beetle of the Silvanidae family and is named after the saw teeth on the sides of its prothorax.

Saw-Toothed Grain Beetle

The Saw-Toothed Grain Beetle (Oryzaephilus surinamensis) is a beetle of the Silvanidae family and is…

The prothorax of the May beetle.

May Beetle

The prothorax of the May beetle.

"Ventral aspect of male cockroach with the wings extended. An imaginary median line has been inserted. A., antennae; E., eye; P.T., prothorax; W1, first pair of wings; W2, second pair of wings; C., cercus; St., style; Co., coxa; Tr., trochanter; F., femur; Ti., tibia; Ta., tarsus." -Thomson, 1916

Cockroach

"Ventral aspect of male cockroach with the wings extended. An imaginary median line has been inserted.…

"A genus of Orthopterous insects, having an oval or orbicular flattened body, the head hidden beneath the large plate of the prothorax, long thread-like antennae, and wings folded only longitudinally. The elytra are parchment-like, and the wings are sometimes very imperfectly developed, particularly in the females, as in the case of the common cockroach." — Chambers' Encyclopedia, 1875

Female Cockroach

"A genus of Orthopterous insects, having an oval or orbicular flattened body, the head hidden beneath…

"A genus of Orthopterous insects, having an oval or orbicular flattened body, the head hidden beneath the large plate of the prothorax, long thread-like antennae, and wings folded only longitudinally. The elytra are parchment-like, and the wings are sometimes very imperfectly developed, particularly in the females, as in the case of the common cockroach." — Chambers' Encyclopedia, 1875

Male Cockroach

"A genus of Orthopterous insects, having an oval or orbicular flattened body, the head hidden beneath…

Having the form of a cross with equal arms, as the flowers of mustard.

Cruciate Flower

Having the form of a cross with equal arms, as the flowers of mustard.