. Annals of the Entomological Society of America. Entomology. IQOS] (lassification of the Corduliiuae 277 longitudinally, is established; there is nothing like a bisector in the Macromian line. The anal loop, although just beginning to l)e recognized and used in the systematic study of the Odonata, has undoubtedly played a role of first importance in the evolution of the wings of the Corduliinae. Within the restricted group just defined the tip of the anal loop has developed in two divergent ways:. Fig. 8. Tj^pical structures of Corduline wings: (a) the wings of Tetrago- neuria cynosura Say; (
. Annals of the Entomological Society of America. Entomology. IQOS] (lassification of the Corduliiuae 277 longitudinally, is established; there is nothing like a bisector in the Macromian line. The anal loop, although just beginning to l)e recognized and used in the systematic study of the Odonata, has undoubtedly played a role of first importance in the evolution of the wings of the Corduliinae. Within the restricted group just defined the tip of the anal loop has developed in two divergent ways:. Fig. 8. Tj^pical structures of Corduline wings: (a) the wings of Tetrago- neuria cynosura Say; (b) the anal loop of Gomphomacromia paradoxa; (C) the same of Syncordulia gracilis; (d) base of hind wing of Macromia. Veins: (c), costa; (Sc) subcosta; (R) raditis; (M) media; (Cu) cubitus; (A) anal; (Rs) radial sector; other branches numbered from front to rear. Other parts, (ar) arculus; (n) nodus; (st) stigma; (s) supertriangle; (t) triangle; (u) subtriangle; (m) membranule; (x) anal triangle of the male; (1) anal loop; (y) radial supplement; (z) median supplement. (i) It has extended itself outward parallel to the vein Cui in a bilaterally symmetrical point, and the tendency of the triangle to be concurrently retracted to the level of the arculus has been least where the elongating loop has most closely paralleled vein Cui. (Idomacromia, etc.) This tendency may be said to char- acterize in a general way Williamson's groups III and IV, with Neoph^^a added to group IV. The Triangle has reached the level. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Entomological Society of America. [College Park, Md. , etc. ] : Entomological Society of America
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