. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 34 THE IMAGO [CH. The diversity of form in these appendages is immense. Except in the Lihellulinae, and a few Gomphinae, practically every species is at once determinable by the form of its appendages. Hence hybridization is a very rare occurrence in the Odonata. In the. Fig. 14. Anal appendages of male Dragonflies. a-h Anisoptera, j-l Zygoptera. A. Austropetalia patricia Tillyard, dorsal view. B. The same, lateral view, c. Gynacantha rosenberghi Selys, dorsal view. D. Gomphus vulgatissiynus Linn., dorsal view. E. Bifid in
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 34 THE IMAGO [CH. The diversity of form in these appendages is immense. Except in the Lihellulinae, and a few Gomphinae, practically every species is at once determinable by the form of its appendages. Hence hybridization is a very rare occurrence in the Odonata. In the. Fig. 14. Anal appendages of male Dragonflies. a-h Anisoptera, j-l Zygoptera. A. Austropetalia patricia Tillyard, dorsal view. B. The same, lateral view, c. Gynacantha rosenberghi Selys, dorsal view. D. Gomphus vulgatissiynus Linn., dorsal view. E. Bifid inferior appendage of same (hidden beneath s in d). f. Austrogomphus melaleucae Tillyard, dorsal view, shewing hooks (h). G. The same, lateral view. H. The same, occiput of $ shewing tubercles (t) which engage the appendages of the male. j. Isosticta simplex Martin, dorsal view. K. Ischnura heterosticta Burm., dorsal view. L. Hemiphlebia mirabilis Selys, dorsal view, shewing white ribbon-like inferior appendages, i inferior; s superior appendages, (a, b. d-h x 8, c x 5, j-l x 15.) Original. case of those groups where the appendages are sufficiently similar to admit of the possibiUty, we find very dissimilar developments of the accessory genitalia of segment 2 in the male. Here, then, a second almost insuperable barrier is set 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 Tillyard, Robin John, 1881-1937. Cambridge [Eng. ] : University Press
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