The tergite of the prothorax (pronotum) is prominent in all beetles, reaching back to the bases of the elytra and forming a substantial shield for the front part of the body.
The external part of the lateral field subsequently 14 grows up, and by coalescence with its fellow forms the t6 tergite or dorsal part of the segment.
A, anus; Abx 1 Abx 11, appendage of 1st and of 11th abdominal segments; Ans, anal piece=telson or 12th abdominal segment; Ant, antenna; De, deuterencephalon; Md, mandible; Mx1, first maxilla; Mx2, second maxilla or labium; 0, mouth; Obcl, rudimentary labrum and clypeus; Pre, protencephalon; St t, Stu), stigmata i and io; Terg, tergite; Thx1, appendage of first thoracic segment; Tre, tritencephalon; Ul, a thickening at hinder margin of the mouth.
Md, Muscle from tergite of genital somite to entosternum (same as dpm in fig.
Between the bases of the sixth pair cf limbs and behind the prosomatic carapace is seen the tergite of the small prae-genital somite.