Air-sacs or vesicles: pouch-like expansions of tracheal tubes in heavy insects, capable of inflation and supposed to lessen specific gravity.
"Explanation of Terms Used in Entomology" by John. B. Smith
The ovaries consist of eight pouches, placed near the point of junction of the four chymiferous tubes.
"Seaside Studies in Natural History" by Elizabeth Cabot Cary Agassiz
From one side of this pouch is given off a small tube about four inches long, closed at the lower end.
"A Civic Biology" by George William Hunter