. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Odoncda or Drago-nflies of South Africa. 249 pound eye. Vision is evidently the dominant sense of the dragonfly ; parallel with the hypertrophy of the eye we find an extreme reduction of the antennae—the organs of scent. A similar combination is found in the Order Ephemeridae or Mayflies, and to some degree in many of the more highly specialised Diptera. The configuration of the compound eyes largely affects in dragouflies the arrangement of the other parts of the head, and a better idea than any
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Odoncda or Drago-nflies of South Africa. 249 pound eye. Vision is evidently the dominant sense of the dragonfly ; parallel with the hypertrophy of the eye we find an extreme reduction of the antennae—the organs of scent. A similar combination is found in the Order Ephemeridae or Mayflies, and to some degree in many of the more highly specialised Diptera. The configuration of the compound eyes largely affects in dragouflies the arrangement of the other parts of the head, and a better idea than any description can. FIG. 2.—Podogomphus praetorius. Dorsal, frontal and ventral views of head. Lettering as in Text-fig. 1. give will be conveyed by our Text-figs. 1-3, where three modifications are shown: the zygopterous head with widely separate, almost hemispherical eyes, in Text-fig. 1 ; the Gromphiue head, which is intermediate between the zygopterous and the regular anisopterous configuration in Text-fig. 2; the Libel] uline head in Text-fig. 3 is a representative of this fully developed auisopterous configuration, where the eyes meet in the median line for some length. Three ocelli are present in the entire order ; their position is open in the. 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 South African Museum; South African Museum. Annale van die Suid-Afrikaanse Museum. Cape Town [etc. , South African Museum, etc. ]
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