'242 Annals Entomological Society of America [Vol. XIII, 



EXPLANATION OF PLATES. 



Plate XXIH. 



Pig. ,1. Semidiagrammatic representation of ventral aspect of digestive system 



based upon dissections and reconstructions from sections, lOX. 

 Pig. 2. The same viewed from the left side. 



Plate XXIV. 



Pig. 3. Diagram of the digestive organs showing the relationships of the various 

 parts and the course of the food stream. 



Pigs. 4, 5, 6. Diagrammatic figures of cross sections in anterior crop region show- 

 ing probable method of complication resulting in intimate relation 

 between anterior crop and "internal gland." Cf. Pigs. 6 and 9. 



Plate XXV. 



Pig. 7. Frontal section through internal gland and anterior part of descending 



intestine. 

 Pig. 8. Vertical section through floor of anterior crop. 

 Fig. 9. Transverse section through forward part of internal gland, anterior crop 



and descending intestine. 



Plate XXVI. 



Fig. 10. vSagittal section showing junction of esophagus with anterior crop. 

 Pig. 11. Section through extreme anterior portion of posterior crop showing 



details of cell structure. 

 Pig. 12. Same slightly posterior to Fig. 11. 

 Pig. 13. Same midway between extremities of posterior crop. 



Plate XXVII. 



Fig. 14. Section showing junction of posterior crop and ascending intestine. 

 Pigs. 15, 16, 17. Transverse sections through different parts of ascending intestine 

 showing different phases of digestive activity. 



Plate XYVIII. 



Pig. 18. Transverse section through descending intestine at its anterior end. 

 Pig. 19. Same, midway between its extremities. 



