94 Annals Entomological Society of America [Vol.1, 



A series of transverse sections of the duct of the colleterial 

 sac, shows the presence of a large ventral fold, which is partly filled 

 with muscles and grooved at its middle (Figs. 14 and 15). The 

 epithelial layer is somewhat better developed around this fold 

 than at any other part of the duct. Around this fold the long 

 axis of the ovoid nucleus is at right angles to the chitinous intima, 

 but to either side of the fold, they gradually change their position 

 and assume a direction more or less parallel to the intima (Figs. 

 14 and 15, n). The chitin lining the lumen is extremely thick. 

 Near the opening of the duct are two bundles of transverse muscles 

 which leave the chitinous intima and attach to the basal margin 

 of the sheaths of the saws (Fig. 14, tm) . These muscles when they 

 contract, aided probably with the elasticity of the thick chitinous 

 intima, close the duct. 



A longitudinal section of this same duct shows that the muscles 

 which, as already described from a cross section, partly fill up the 

 large fold, can be traced over from the colleterial sac. Within 

 the fold they spread out fan-like and attach to the chitinous 

 intima (Fig. 12). These muscles when they contract open the 

 duct. 



A closer examination of the longitudinal section shows that 

 the wall of the large ventral fold (Fig. 18, vf) when traced to the 

 region where the duct opens out, bends upon itself and is contin- 

 uous w4th the dorsal wall of the common oviduct. The chitinous 

 intima of the large ventral fold decreases gradually in thickness 

 toward the opening of the duct, and bending upon itself, continues 

 as a layer of chitin of almost uniform thickness to the triangular 

 chitinous plate. (Fig. 18, chp) which, as already described, rests 

 upon the dorsal wall of the common oviduct betw^een the sper- 

 matheca and colleterial sac. Projecting here and there from this 

 chitinous intima near the opening of the duct of the sac, are long, 

 yellowish bristles. Besides these bristles, large multinucleated 

 glands with a pore canal penetrating the chitinous intima in their 

 neighborhood and peculiar sense organs are scattered between the 

 epithelial cells. 



These sense organs project as papillae from the chitinous inti- 

 ma, and are very evident when the colleterial sac duct is mounted 

 in toto. At the distal end of these papillae is a ring of chitin 

 enclosing a circular opening. This ring of chitin stains with gen- 

 tian violet. The papilla is in connection with a clear bladder- 

 like structure, which is surrounded by a somewhat granular pro- 



