BY R. J. TILf.YAKD. 



175 



of a straight supplement paralh'l to A2{Fig.8, X); while, in the 

 very broad-winged female, even A^ is dragged in to make a third 

 support, giving the insect an apparently three-portioned anal 

 loop of immense width. 



Fig.5. 



Fig.7. 



Ficr.6. 



Fig.S. 



'E\g.b. — Synthemis macrostigma Selys. Trachealion of a half -grown 

 nymphal hindwing.(Blue Mountains; Sept., 1913). 



Fig. 6. — Synthemis macrostigma Selys, S . Tracheation of nearly full- 

 grown nymphal wings. A, forewing; B, liindwing. 



Fig.7. — Synthemis macrostigma Se\ys, S ' Portion of imaginal venation, 

 to show structure of anal loop. 



Fig.S. — Synthemis reyina Selys, ? . Portion of imaginal venation, to show 

 structure of compound anal loop. The vein X is not developed 

 along any main tracheal branch, but is a supplement comparable to 

 Cuspl in Hemicorclulia and the Libellulime. 



