186 DEVELOPMENT OF THE WING-VENATION OF ODONATA. 



sharply downwards, and runs to the wing-border. A small 

 trachea from Cuo meets it a little below this final bend (Fig. 16, 

 and Plate xi., fig. 12). 



Fig. 15. 



Fig. 17. 



Fi-.16. 



Fig. 18. 



Fig. 15. — Austrogomphus ochraceus Selys^^Jt. Tracheation of a nymphal 



hindwing, not quite full-grown. (Lily Vale, N.S.W.; Feb., 1914). 

 Fig. 16. — Hemigowphus heteroditus Seh's,^. Tracheation of full-grown 



nymphal hindwing. (Stanwell Park, N.S.W.; Feb., 1914). 

 Fig. 17. — Auslrogomphns ochraceus tSel3's,^. Portion of imagiual venation 



of hindwing. (Heat)icote; Nov., 1911). 

 Fig. 18. — Hemigomphua IiPleroclitiLS Selys,^. Portion of imaginal venation 



of hindwing. (Heathcote; Nov., 1911). 



We see from this that the anal trachea is more primitive in 

 the GomphiiLce than in the groups already discussed, in so far as 



