No. 489] SILK GLANDS OF APANTELES 581 



Fig. 28, pi. 3.— Longitudinal section of the press, showing the position of, 

 the dorsal and ventral muscles, s. L, silk thread passing through the 



Fig. 29, pi. 3.— Same as Fig. 28, but showing the attachment of the muscles 

 directly to the chitin of the conducting tube. X 267.5. 



Fig. 30, pi. 3.— Longitudinal section of the press, of one of the conductmg 

 branches, and of the beginning of the 1st thoracic portion, a., point 

 of union with the conducting branch of the opposite side. X 2(j7.n. 



