98 Annals Entomological Society of America [Vol.1, 



EXPLANATION OF PLATE IV. 



Fig. 8. Longitudinal section through the common colleterial gland duct 

 and colleterial sac, showing the opening of the former into the latter: o, open- 

 ing of the common colleterial gland duct into the colleterial sac; sp, spine; en, 

 "endothelial or centro-tubular" nucleus; n, epithelial nucleus of the colleterial 

 sac; c, canal of "vesicule radiee"; vr, "vesicule radiee", "vesicule secretante" 

 or "vesicule intracellulaire". (x307.) 



Fig. 9. Cross section of cells of the colleterial glands : ch, chitinous intima ; 

 en, "endothelial or centro-tubular" nuclei; c, canal of vesicule radiee; vr, "vesi- 

 cule radiee", "vesicule secretante" or "vesicule intracellulaire". (x647.) 



Fig. 10. Longitudinal section of cells of the common colleterial gland duct : 

 ch, chitinous intima; c, canal of "vesicule radiee", en, "endothelial or centro- 

 tubular" nucleus; vr, "vesicule radiee", "vesicule secretante" or "vesicule 

 intracellulaire"; Is, longitudinal striations of cvtoplasm; ?, granular cvtoplasm. 

 (x900.) 



Fig. 11. Longitudinal section showing the cellular change between the 

 common colleterial gland duct and colleterial sac; ch, chitinous intima; c, 

 canal of "vesicule radiee"; en, "endothelial or centro-tubular" nucleus; vr, 

 "vesicule radiee", "vesicule secretante" or "vesicule intracellulaire"; cp, 

 nucleus of epithelial cell; Is, longitudinal striations of cytoplasm; g, granular 

 cytoplasm; a, transition of epithelium of duct to that of sac; s, spine; m, muscles. 

 (x647.) 



Fig. 12. Longitudinal section of the colleterial sac duct: sc, secretion; sp, 

 spine; ch, chitinous intima; »?, muscles of sac that pass into the ventral fold of 

 duct and, spreading out fan-,=^.hape, attach to the chitinous intima. (xl20 ) 



