Plate 10. 



Fig. 109. Young larva of Tabanus sp.? tr, tracheal trunk; g, Graber's organ. 

 After Henneguy. 



Fig. 110. Graber's organ, enlarged, of larva figured in Fig. 109. After 

 Henneguy. 



Fig. 111. Larva of Tabanus sp.?, showing the location of Graber's organ (the 

 latter drawn larger than in proportion to the size of the larva). After Paoli. 



Fig. 112. Graber's organ in full grown larva of Tabanus sp.?, with muscle 

 and nerves attached to it. cl to c7, capsules; cp, pedunculate bodies; m, 

 muscle; n, nerve. After Paoli. 



Fig 113. Hypothetical diagram of the development of Graber's organ, c 1, 

 first capsule; c 2, second capsule; hp, hypoderm; ct, cuticle. After Paoli. 



Fig. 114. Terminal tube of Graber's organ. /?/>, hypoderm. After Paoli. 



Fig. 115. Last three segments of larva, showing Graber's organ in situ. Dor- 

 sal view tr, tracheal trunk; m 1, muscles of the first pair; a, anal tubercle. 

 After Paoli. 



Fig. 116. Last three segments of larva, with Graber's organ. Lateral view. 

 in 2, muscle of the second pair; /, terminal tube. Other details as in Fig. 115. 

 After Paoli. 

 Fig. 117. Young larva oi Tabanus quatuonwtatus. After Lecaillon. 



Figs. 118 and 119. Posterior end of body of larva of Tabanus quatuornotatus, 

 somewhat older than that figured in Fig. 117, showing the pedunculate bodies 

 being expelled through the terminal tube. After Lecaillon. 



Fig. 120. Dorsal view of Segments 11 and 12 (syphon) of a young larva 

 Tabanus corax, showing Graber's organ; the dotted lines show the position of the 

 anus. After Neave. 



