344 
Psyche 
[December 
from the main trunk behind, and on the opposite side to, 
trachea 3. It runs forward and its second branch is the 
outer arm of a Y which joins, in the wing-bud, the outer 
branch of the Y in the other trachea. The inner arm of this 
Y runs toward the center of the body, forming the posterior 
stem of the leg trachea, and anastomosing with the inner 
arm of the Y from the trachea arising near the protho- 
racic spiracle and the trachea formed by this union goes 
to the leg. Thus the mesothoracic leg is supplied by 
tracheae from origins before and behind. Also, a branch 
of trachea 3 ends in the leg, making the supply from be- 
hind a double one. 
The tracheae to the metathoraeic leg are similar to those 
to the mesothoracic leg. There is an anterior stem, arising 
from a branch from the main trunk, and a posterior stem 
arising from a forward directed branch of the main trunk. 
The branches of the main trunk also send branches out 
that meet in the wing-bud. These branches joining in the 
wing-buds of the meso- and metathoraeic segments con- 
stitute the dorsal longitudinal trunk of the thorax. Trachea 
5 sends a branch to the metathoraeic leg in the same man- 
ner as does trachea 3 to the mesothoracic leg. 
In the pupa of Antherax pernyi Guer., according to En- 
derlein, (1902), the arrangement of the tracheae to the legs 
is very different from that of the larva of Pyrausta nubil- 
alis. The prothoracic leg is supplied by two branches from 
the trachea to the antenna, and by two branches from a 
branch to the supracesophageal ganglion, making four 
tracheae enter this appendage. The meso- and metathoraeic 
legs are each supplied by a single trunk. 
Peterson (1912) figures the tracheal system of Proto- 
parce Carolina without showing the distribution of the 
branches, except in the case of the legs, and here he shows 
but a single trachea to each of them. 
Chapman (in Comstock 1918) figures the tracheation to 
the meta- and mesothoracic legs in the pupa of Antherxa 
roylei , and his figure agrees, in the main, with the distribu- 
tion shown by Pyrausta nubilalis. He does not show the 
supply to the prothoracic leg. 
Regarding Enderlein’s figure, Chapman says: “The con- 
