(105) 



STRUCTURE, DEVELOPMENT, AND BIONOMICS OF HOUSE-ELY. 545 



PLATE 33. 



FIG. 29. Alimentary system of mature larva. The course of the ventriculus 

 and intestine as they lie in the larva is shown by the dotted lines. The 

 origins only of the Malpighian tubes are shown. 



c.s.d. Common salivary duct. c.v. Caecum of ventriculus. int. Intestine. 

 m.t. Malpighian tubule, ce. (Esophagus, ph. Pharynx, pv. Proventriculus. 

 r. Rectum, s.gl. Salivary gland, v. Ventriculus. 



PIG. 30. Transverse section of a portion of the veutriculus of mature 

 larva. (Camera lucida drawing.) 



e.v. Epithelial cell of ventriculus showing large active nucleus and striated 

 peripheral region of cell. g.s. Probable gland cells, i.e. Group of imaginal 

 cells. 



FIG. 31. Horizontal section of posterior or "cardiac" region of the dorsal 

 vessel. (From camera lucida drawings.) 



os. Ostium. v. Valvular flaps guarding the same. 



