. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Stone-flies (Perlaria), with Descriptions of New Species. 515 In all cases, except Desmonemoura in which the act has not been observed, the <J and $ lie side by side, both abdomens turned slightly. Fig. 1.—Aphanicercella barnardi Tillyard. a, $ and $ showing position in copula, wings of $ removed; b, dorso-lateral view of <$ and $ abdomens; c, d, lateral and ventral views showing supra-anal lobe and titillators of $ within vulva of $ (diagrammatic; pleurite and cercus in c omitted). towards one
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. Stone-flies (Perlaria), with Descriptions of New Species. 515 In all cases, except Desmonemoura in which the act has not been observed, the <J and $ lie side by side, both abdomens turned slightly. Fig. 1.—Aphanicercella barnardi Tillyard. a, $ and $ showing position in copula, wings of $ removed; b, dorso-lateral view of <$ and $ abdomens; c, d, lateral and ventral views showing supra-anal lobe and titillators of $ within vulva of $ (diagrammatic; pleurite and cercus in c omitted). towards one another, and the apex of the $ abdomen curved upwards and slightly forwards (figs. 1 and 2). In Aphanicercopsis and Aphani- cercella the supra-anal lobe enters the vulva, the denticles on its lower margin engaging the ventral wall of the vulva and serving to anchor the lobe in posi- tion. The object of the lobe seems to be to prepare the way for the entry of the more delicate titillators or in- tromittent organs, which penetrate the oviducts to their full extent. In Aphanicerca the mating position is the same, and it cannot be doubted that the supra-anal lobe enters the vulva; but the sexes separate so readily that it has not been possible to secure a pair in copula, in spite of many attempts with the common A. capensis. The bilobed dorsal process of the IXth segment probably acts as a clasper. Oviposition has not been observed, but the ripe eggs of some of the species are described 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. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
