Difference of opinion as to the nature of the abdominal appendages pre vails.
The fourth abdominal segment is often very large, and forms the greater part of the hind-body; this segment is markedly constricted at its basal (forward) end, where it is embraced by the small third segment.
The larvae have the three pairs of legs well developed, and the hinder abdominal segments swollen.
N, First Abdominal Segment.
In Hemiptera only eleven and in Collembola only yolk, and that the mesenteric epithelium becomes reinforced by six abdominal segments have been detected.