41 



41 



[42) 



FIGURE 42. Cephalic tracheae of P 1 e c - 

 trocnemia conspersa (after Novak): 



1 —dorsal cephalic trachea; 2 — ventral ce- 

 phalic trachea; 3 — trachea of subesophageal 

 ganglion; 4 — trachea of eyes; 5 — trachea of 

 labrum. 



FIGURE 43. Tracheae of the abdomen of the larvae 

 of Stenophylax sp. (transverse section) (after 

 Novak): 



1 — dorsal blood vessel; 2 — intestine; 3 — longi- 

 tudinal lateral trachea; 4 — abdominal ganglion; 

 5 - dorsal gill; 6 — preoral gill; 7 — ventral gill. 



FIGURE 44. Spinning glands of 

 Neureclipsis bimacula- 

 ta (after Brickenstein) 



The glandular cells of the secretory part are large with a striated proto- 

 plasm which becomes denser near the excretory duct; the nuclei of these 

 cells are large, curved when the cells are young; they later become branched, 

 with large nucleoli and uniformly distributed chromatic granules (Figure48); 

 during silk secretion the nucleus becomes larger, the chromatin granules 



37 



