PLATE XV 



Figure 1. The thorax of Chrysops dispar, seen from behind, to 

 show the mesophragma. mtn"'., the metanotum. h., 

 halter, p.s., posterior spiracle, p.f., post-furca. ex'"., 

 coxa of the third leg. th.o., thoracic outlet, through 

 which the organs pass to the abdomen. mph., 

 mesophragma. X 28. 



Figure 2. A halter of Chrysops dispar. X 70. 



Figure 3. The tarsus and foot of Haematopota pluvialis. The 

 empodium is pulvilliform. X 66. 



Figure 4. The apodeme of the mesothorax of Tabanus albi- 

 medius, or the medifurca. x 90. 



Figure 5. The foot of Ctilex fattgans. Note the flange on the 

 proximal part of the claw, x 500. 



Figure 6. The prosternal region of Haematopota pluvialis, seen 

 from the inside. ps'.,the presternurn. st'.,the sternum, 

 epm'., the epimeron. eps'., the episternum. stl'., the 

 sternellum. a.f., the anterior fibres, and p.f., the 

 posterior fibres, which run to the side walls of the 

 thorax, f.l., space for the articulation of the foreleg, 

 x 90. 



Figure 7. A leg, to show the divisions, ex., coxa. tr., tro- 

 chanter. fe., femur, tb., tibia, int., metatarsus, t., 

 tarsus. 



