224 
Psyche 
[September 
branches. The anterior one goes to the salivary gland. The 
next three run to the ganglia, and the posterior two supply 
fat bodies (fb fig. 2). The three tracheal branches here 
mentioned, together with the branches described in the 
former section on transverse tracheae, appear to be all of 
the branches to the “brain.” 
The ventral ganglionic mass (g figs. 2, 3) , a large append- 
age of the brain lying ventral to the alimentary tract, re- 
ceives its tracheae from branches from the ventral tracheal 
trunks (Vt fig. 3). 
As far as I can determine from my notes the first ventral 
trachea to the abdominal central nervous system arises in 
Fig. 1. Sketch of tracheae as seen through the body wall in the anterior 
end of a larva. Fig. 2. Tracheae and organs in anterior part of body. 
Fig. 3. Tracheae to the ventral ganglionic mass. Fig. 4. Study of tracheae 
in posterior end of body, al, alimentary tract, and tracheae to alimentary 
tract; br, “brain”; Dt, dorsal tracheal trunk; fb, tracheae to fat bodies; g, 
ventral ganglionic mass; m, muscle layer; ml, muscle crossing ventral tracheal 
tract; ph, pharynx; S ?, position of anterior spiracle?; sg, salivary gland; tr, 
transverse trachea; ur, urinary tubule; Vt, ventral longitudinal trunk; 1; 
trachea branching to gland, ganglia and fat bodies; 2, trachea sending branches 
to urinary tubules. 
