92 Annals Entomological Society of America [Vol.1, 



The transition from the spermatheca to the common oviduct 

 is not difficult to determine, the chitin of the former losing its 

 regularly folded appearance, and becoming more or less irregularly 

 folded in the latter. The bristles, which in the spermatheca 

 were regularly arranged on one side of the folds, do not have this 

 uniform arrangement in the oviductus communis, but are clus- 

 tered in groups (Fig. 3,6). 



Accessory glands and sac: A study of sections cut through 

 the accessory glands and ducts shows them to consist of the fol- 

 lowing layers, passing from within, outward: (i) a chitinous 

 intima; (2) the so-called "endothelial or centro-tubular cells" of 

 Feniard (15); (3) an epithelial layer; (4) a basement membrane; 

 and (5) a peritoneal membrane. 



Each cell of the accessory glands contains a so-called ' ' vesicule 

 secretante or vesicule intracellulaire " of Dierkx (13) or "vesicule 

 radiee" of Henneguy (18). This vesicle is more or less oviform 

 in shape and oftentimes strands of cytoplasm radiate from it 

 (Fig. 9, vr). A small chitinous canal [canalicule intravesiculaire 

 of Dierkx (13)] leaves the vesicle, follows a sinuous path to the 

 chitinous intima, which it penetrates, and opens out into the 

 lumen of the gland (Fig. 9, c). This canal, or its contents, stains 

 with gentian violet and to a slight extent with haematoxylin. 

 The nucleus is found in the basal half of the cell usually close to 

 the vesicle. 



The "endothelial or centro-tubular cells" are represented in 

 Cimbex by nuclei, which are usually crowded against the chi- 

 tinous intima (Fig. 9, en) or wedged in between the inner ends of 

 two glandular cells. 



A comparison of a transverse section through the accessory 

 glands with a similar section cut through the right or left colleterial 

 gland duct or the common colleterial gland duct shows some 

 marked differences. The sections show a different stainability, 

 especially with the triple stain. The cytoplasm of the accessory 

 gland cells stains deeply and the vesicle with its canal cannot 

 usually be distinctly seen; in the ducts, however, the vesicle 

 with its canal is well defined, the cytoplasm stains less deeply 

 and shows a distinct longitudinal striation towards the basal end 

 of the cells, but near the chitinous intima this striation is grad- 

 ually lost and the cytoplasm becomes more homogenous (Fig. 10). 

 In the accessory glands the large nucleus is spherical in shape and 

 is found in the basal region of the cell, while in the ducts the more 



