presents the appearance delineated in the adjoining wood-cut.
The pupa having made so much nearer an approach to the perfect form than the larva, exhibits some indication of the principal divisions of the body which afterwards become so strongly marked. A slight constriction frequently points out the boundaries of the head, thorax, and abdomen. Regarding the exterior sheath as the case (theca) of the pupa, Kirby and Spence have assigned a nomenclature to its principal parts: the anterior division enclosing the head, is called the Head-case (cephalo-theca); next to this is the Trunk-case (cyto-theca); and lastly the Abdomen-case (gastro-theca). The coverings of all the other parts receive names from the Greek words for these parts compounded with theca; thus the
