324 : BOARD OF AGRICULTURE. 
stomachs of the beetle-larve, and the embryos thus liberated 
penetrate by means of their boring spines through the intes- 
tines into the body cavity of the larve; here they become 
more developed, and finally reach the intestines of the pigs 
when the latter devour the beetle-larve containing them, and 
there grow to maturity. When the embryos have arrived 
in the body cavity of the larve of Melolontha, they remain 
for some days unaltered and capable of motion; they then 
become rigid, acquire an oval form, and envelope themselves 
in a finely cellular cyst, which is formed of the connective 
tissue of the larva. The skin of the embryo, with its circlet 
of spines at the anterior end, continues at first to be the skin 
of the growing larva, and it is only at a later period, when 
the formation of the hooks commences, that it is thrown off, 
when it forms a second cystic envelope. 
The beetle-larve infested with the young Hchinorhynchi live 
on until their metamorphosis into cockchafers. As the thorax 
of the cockchafer is sometimes eaten by man, we can under- 
stand that the Hehinorhynchus gigas may also get into the 
intestines of man. It has once been found in that situation 
by Lambl. Professor Schneider also describes the develop- 
ment and metamorphosis of the larva of the Hchinorhynchus, 
with reference to its internal organization. 
It is probable that in this country the eggs of this parasite 
hatch in the larve of the May-bugs (Lachnosterna), and 
goldsmith-beetles ( Catalpa lanigera), which are allied to the 
cockchafer of Europe and have similar habits. These larve 
are large, plump, whitish or yellowish grubs, usually darker 
posteriorly, and furnished with three pairs of legs. They are 
always abundant in manure heaps and in the soils of yards 
and gardens, but are also found in fields and pastures, so that 
there are abundant opportunities for them to get at the eggs 
of the Hchinorhynchus, dropped by the pigs, and for them to 
be devoured in their turn by the pigs. 
