M. E. Hesse on the Pranizze and Ancei. 407 
gone their last metamorphosis and arrived at the state of Ance7; for 
then the thorax, divided into two distinct portions by a strongly 
marked constriction, simulates a sort of corselet at the fore part ; 
greatly developed mandibles, resembling nippers,rival those of the 
Scarite and Manticore ; lastly (and this is an extremely curious 
fact), these appendages, which are so exuberant in the males of the 
above insects, as in the males of our Crustacea, are wanting in 
the females of the latter—a character which, however, is not so 
absolute in the females of the Beetles above mentioned, as they 
have mandibles like those of the males, but comparatively of 
very small size; and, finally, some parts of the thorax present 
appearances of elytra, as in Meloé’’*, 
Metamorphoses undergone by the Pranizee at their escape from 
the Egg. 
Scarcely have the female Ancez arrived at their final state tay 
their numerous eggs make their appearance in a large mem- 
branous pouch beneath the thorax. The eges are of large com- 
parative size, and of a spherical form; they are covered by a 
transparent and slightly rugose skin, through which a single 
vitellus may be seen; their incubation occupies from twenty 
to twenty-five days, but sometimes less, according to the season 
and the temperature. 
In the first phase of development of the embryo, the mass of 
matter contained in the egg has a flattened oval form, showing 
at its superior extremity a dilatation divided into three lobes. 
The median lobe forms the frontal region, and the two lateral 
ones are the first traces of the eyes or antenne, or perhaps of 
both. The various parts gradually advance towards perfection, 
the young Ancei remaining all the time firmly adherent to their 
mother, and protected by thoracic plates, which cover them until 
they are capable of seeking their own nourishment. 
At this period the young Ancez have the head and limbs 
relatively very large; the head is triangular, convex above, and 
flattened beneath ; the rostrum, which forms the apex of the 
triangle, is curved downwards. This rostrum presents, including 
a triangular frontal process which covers and consolidates the 
whole apparatus, four double symmetrical organs, namely— 
1. Two large, flat mandibles, forming a pincer, denticulated 
at the extremities. 
2. Two styliform appendages, likewise denticulated at the 
end. 
3. Two opercular footjaws. 
* This observation was already made by Mr. Westwood in 1832, Ann. 
Sei. Nat. t. xxvil. p. 331. 
