PLATE XXVIII 



Figure 

 Figure 

 Figure 

 Figure 



t. 



v.d. 



c.d. 



v.s. 



a.g. 



P- 



p.s. 

 t'. 



1. 



2. 

 3. 



4. 



The genital organs of Tabanus, 3 . x 20. 



The genital organs of Muscct, 3 . 



The genital organs of Culex, 3 . x 50. 



The genital organs of Hippobosca, 3 . They resemble 



those of Glossina. X 90. 



Reference letters 



testes. 



vasa deferentia. 



the common ejaculatory duct. 



vesicula semisalis. 



accessory glands. 



penis. 



sheath of the penis. 



in figure 4, the terminal portion of the testicular tubs. 



