350 
Psyche 
Fat Tissue 
[December 
The fat tissue surrounding the organs, not the fat bodies, 
receives its air supply from small branches of the tracheae 
to the organs. Figure 22 shows tracheae to fat tissue about 
the central nervous system. 
Acknowledgement 
The material used in making the above study was mature 
hibernating larvae of the Massachusetts strain of Pyrausta 
nubilalis. They were given to me by Mr. D. W. Jones, Ento- 
mologist in charge of the United States Department of 
Agriculture Field Laboratory at Arlington, Mass. I wish 
to acknowledge the kindness of Mr. Jones, and of other 
members of the Arlington Laboratory staff, who have shown 
interest in the work. 
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