LIST OF ILLUSTRATIONS 



xxiit 



PLATE 



Fig. 4. 



Fig. 5. 



XXIV. Fig. 1. 



Fig. 2. 



Fig. 3. 



Fig. 4. 



Fig. 5. 



.... Fig. 6. 



Fig. 7. 



Fig. 8. 



XXV. Fig. 1. 



Fig. 2. 



... Fig. 3. 



Fig. 4, 



Fig. 5. 



Fig. 6. 



XXVI. Fig. 1. 



Fig. 2. 



XXVII. Fig. 1. 



Fig. 2. 

 Fig." 3. 



Fig. 4. 



Fig. 5. 







Fig. 6. 



Fig. 7. 



Fig. 8. 



Fig. 9. 



Fig. 10. 



Fig. 11. 



XXVIII. Fig. 1. 



Fig. 2. 



FACING PAGE 



Mid-gut of Culex, as seen in a routine 



dissection. 

 Schematic longitudinal section through 



commencement of mid-gut of Culex ... Ill 



Alimentary tract of Philaematomyia in- 



signis. 

 Longitudinal section through the proven- 



triculus of Philaematomyia. 

 Cells from the hind-gut of Philaema- 

 tomyia. 

 Diagramatic transverse section showing 



position of peritrophic membrane. 

 Diagramatic longitudinal section showing 



the position of the peritrophic membrane. 

 Distal end of the malpighian tube of 



Philaematomyia. 

 Proximal end of the malpighian tube of 



Philaematomyia. 

 Alimentary tract of Glossina ... +*. 116 



Hind-gut of Hippobosca maculata. 

 Transverse section through posterior part 



of abdomen of Haematopota pluvialis. 

 Cells from the mid-gut of Philaematomyia. 

 Cells from the middle portion of the gut of 



Philaematomyia. 

 Longitudinal section through abdomen of 



Philaematomyia. 

 Rectum of Musca ... ... 118 



Villus of the mid-gut of Tabanus, during 



digestion. 

 Villus of the mid-gut of Tabanus, during 



digestion as seen at a lower level ... 125 



Nervous system of Tabanus. 



Pericardial cells from Haematopota. 



Fat body from Philaematomyia. 



Compound thoracic ganglion from Musca, 



Salivary gland of Haematopota, in trans- 

 verse section. 



Longitudinal section through the salivary 

 gland of Culex. 



Salivary gland of Culex fatigans. 



Salivary gland of Anopheles rossii. 



Salivary gland of Tabanus albimedius. 



Cells of the labial salivary gland of Hae- 

 matopota. 



Scheme of the circulatory system ... 130 



The genital organs of Tabanus, male. 

 The genital organs of Musca, male. 



