1887 | Entomology. | 483 
jaw, while its broader posterior end has two spiracles, and each 
segment of the body is covered with a transverse row 
After remaining in the digestive canal from one to eight hours 
the larvæ pass out through the wall of the canal, and enter di- 
rectly into the ganglia which lie close beneath the canal, gener- 
ally leaving those ganglia free which are separated from the canal 
by the interposition of the silk-glands 
A single silkworm has usually one or two of its ganglia in- 
fested by the maggots, but sometimes more are found. In one 
case Sasaki found five ganglia thes infested by the parasite. 
Furthermore, a single ganglion may have more than one para- 
site in its interior. Nevertheless, usually but one reaches ma- 
turity. When the maggots once infest the ganglia the silkworm 
becomes generally weakened, and its body presents an unusual 
aspect from severe irritation of the nervous system. e seg- 
ments are swollen out like the caterpillars of some hawk moths, 
disease is usually known by the silkworm-growers as 
Fushidaka or Fushiko,—swelled segment. Generally the maggot 
remains in a ganglion more than a week, and when it has become 
two to five millimetres long, or even larger in size, it gets free 
and passes into the body cavity of the silkworm. After travelling 
through the mass of fat which occupies the greater portion of 
‘this cavity it searches for the portions of the tracheal system of 
its host, where the stigmata open. On reaching one of these 
opening made on entering, and sticking them together with its 
saliva. The mouth of this cup is directed towards the body 
. $ . . . e 
maggot, which rests in the newly-formed cup, projects its anterior 
end into the body cavity from the mouth of the cup, while its 
posterior end is directed towards the bottom of it. In this po- 
cup wiek the maggot hut inhabits biis a dark-brown color, 
partly produced by the action of the saliva upon the fats and 
muscles which build up the cup, bme partially by the fæces 
which the maggot voids. When the cup thus colored is formed 
inside a stigma there appears a jaiero or brownish-black 
tch around the stigma; so the presence of the patch is con- 
clusive evidence of the fact that the silkworm is infested by its 
parasite. The similar marking which occurs on the body of a 
pupa enclosed in a cocoon is always due to the same cause. As 
the maggot grows in size the cup enlarges in proportion, and the 
maggot remains in this abode until it attains its full maturity, no - 
matter whether the silkworm meanwhile turns into a pupa or 
not. The maggot usually leaves the cocoon of its host in the 
