. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Odonata or of South Africa. 253 interruption of flight, The thoracic sutures, as given in our Text- figs. 4 and 5, show clearly the homologies of the parts. In the Zygoptera all the sutures drawn in Text-fig. 4 ai-e visible in many cases, though there are genera and groups where the first lateral suture is obliterated, at least in its upper half. In the Anisoptera this suture disappears regularly upward from a level which corre- sponds approximately to the metastigma; but the homology of parts is
. Annals of the South African Museum. Annale van die Suid-Afrikaanse Museum. Natural history. The Odonata or of South Africa. 253 interruption of flight, The thoracic sutures, as given in our Text- figs. 4 and 5, show clearly the homologies of the parts. In the Zygoptera all the sutures drawn in Text-fig. 4 ai-e visible in many cases, though there are genera and groups where the first lateral suture is obliterated, at least in its upper half. In the Anisoptera this suture disappears regularly upward from a level which corre- sponds approximately to the metastigma; but the homology of parts is not seldom still visible in the disposition of the colours and. FIG. 4.—Phaon iridipennis. Lateral view of thorax, proth. Prothorax. Ip. Posterior lobe of prothorax. ex. Coxa. tr. Trochanter. fern. Femur, mesepist. Mesepisterrmm. mesepim. Mesepimeron. metepist. Metepisternum. metepim. Metepiineron. msiepist. Mesinfraepisternum. mtiepist. Metinfraepisternum. «is. Median suture. Us. Humeral suture. Us., 2ls. First and second lateral sutures, mss. Mesostigma. mts. Metastigma. acts. Antealar sinus, fw. Forewing. hw. Hindwing. pattern. There are two pairs of respiratory stigmata on the thorax : the mesostigrna is in a concealed position in the joint between the pro- and mesothorax, and the metastigma is comparatively large and a leading feature in the structure and pattern of the thoracic side. The feet are slender, though comparatively strong, spiny, with various adaptations of their armature, according to systematic position and sex. The coxae are free, relatively small, the trochanters double ; the femora and tibise of about equal length ; the tarsi short, three-jointed ; the claws mostly with a tooth on their ventral edge. The wings bear neither hair nor scales, only some minute, almost. 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
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