�y��vlog

In those insects in which a median terminal appendage exists between the two cerci this is considered to be a prolongation of the eleventh tergite.

A, anus; Abx1 Abx11, 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; O, mouth; Obcl, rudimentary labrum and clypeus; Pre, protencephalon; St1 St10, stigmata 1 and 10; Terg, tergite; Thx1, appendage of first thoracic segment; Tre, tritencephalon; Ul, a thickening at hinder margin of the mouth.

The external part of the lateral field subsequently grows up, and by coalescence with its fellow forms the tergite or dorsal part of the segment.

I to VI, of the six prosomatic appendages. o, Eyes. prae-gen, Tergite of the prae-genital somite.

Between the bases of the sixth pair of limbs and behind the prosomatic carapace is seen the tergite of the small prae-genital somite.