386 Annals Entomological Society of America [Vol. V,. 
system. The anterior system of trachez soon re-divides many 
times. One of the secondary divisions forms, with the similar 
division of the opposite trachea, a transverse trunk just behind 
the chitinized box supporting the mouthparts. The other 
branches go to the antenne and to the fore and mid legs and 
anterior part of the body. 
From each spiracle of the posterior system four branches are 
given off, two very large, one smaller and one very small. These 
subdivide many times but, as far as could be determined, there 
is no connecting trunk between the two posterior tracheal 
systems. These posterior systems supply the hind legs, 
alimentary canal, reproductive system and all of the posterior 
portion of the body. 
CIRCULATORY SYSTEM. 
No definite dorsal vessel was found. The blood probably 
simply circulates through the open body cavity. 
NERVOUS SYSTEM. 
The nervous system consists of two large fused ganglia, 
lying ventrally in a median position and several nerves con- 
nected with these ganglia. The cephalic ganglion lies above 
and largely in front of the framework of the mouthparts. Its 
anterior and principal portion is large and triangular in shape 
and is distinctly bilaterally depressed into two large lobes. The 
posterior portion of the ganglion greatly diminishes in size and 
divides into two commissures, passing around the cesophagus. 
From the under part of the central and most anterior 
portion of each lobe in the anterior part of the cephalic ganglion 
a small nerve runs to the antenna and from the anterior angles 
of each lobe and laterad of each antennal nerve the optic nerves 
proceed to the eyes. 
The cesophageal commissures continue backward, passing 
above the fused arcus and gradually re-uniting and enlarging 
into the thoracic or infra-cesophageal ganglion. The thoracic 
ganglion is slightly depressed above the mid-dorsal and mid- 
ventral line. There are four very obvious transverse divisions, 
making in all four double-lobed parts or divisions of the 
thoracic ganglion. The posterior division is somewhat nar- 
rower and possibly more plainly divided than are the three 
