. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 272 CLASSIFICATION [CH. anal loop well-formed, variable. Genitalia of seg. 2 of male with divided hamuli. Female with prominent valvula vulvae. Larva usually smooth, with large head somewhat triangular in front; eyes large and rounded; body and legs short (fig. 36 g). Tribe 6. Leucorrhiniini (fig. 134). Sectors of arculus separate or only slightly fused. Lobe of prothorax large, erect, divided and strongly ciUated (as in some genera of Tribe 5 also). Wings at least partly coloured, usually with a dark patch at base of hind
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. 272 CLASSIFICATION [CH. anal loop well-formed, variable. Genitalia of seg. 2 of male with divided hamuli. Female with prominent valvula vulvae. Larva usually smooth, with large head somewhat triangular in front; eyes large and rounded; body and legs short (fig. 36 g). Tribe 6. Leucorrhiniini (fig. 134). Sectors of arculus separate or only slightly fused. Lobe of prothorax large, erect, divided and strongly ciUated (as in some genera of Tribe 5 also). Wings at least partly coloured, usually with a dark patch at base of hindwing. Other characters as in Tribe 5. Tribe 7. Triihemini (fig. 135). Forewing with nodus considerably distad from the middle of the wing; a consequent increase in the number of antenodals; the last one usually incomplete. Sectors of arculus united, less so in fore than in hindwing. Arc. usually between Ax^ and Ax,^. Anal loop long, with outer angle reaching far beyond level of triangle; toe well-developed; midrib complete from base. Fig. 135. Wings of Dythemis velox Hagen, ,S> Central America. (Hw. 32 mm.) Original. to toe, and bent at an obtuse angle, sometimes approaching a right angle. Lobe of prothorax usually slender. Male with divided hamuK, but the outer lobe reduced. Female with very small vulvar scale. Larvae resembling those of Tribe 5. This tribe includes two series: Series 1. Trithemis-Senes. Old World. Series 2. Di/themis-Senes. New 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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