. A manual for the study of insects. Insects. cell lying immediately behind vein III is cell III, and that lying immediately behind vein V is cell V. Accessory Cells.âIn many genera the branches of vein III of the fore wings anastomose so as to form one or more cells beyond the apex of the discal cells (Fig. 239, ^; these are the accessory cells. Discal Vein. â The cross vein at the outer end of the discal cell is termed the discal vein (Fig. 239, :). Patagia. â At the base of each fore wing there is a scale-like ap- pendage ; these are the patagia. The patagia correspond to the tegulse
. A manual for the study of insects. Insects. cell lying immediately behind vein III is cell III, and that lying immediately behind vein V is cell V. Accessory Cells.âIn many genera the branches of vein III of the fore wings anastomose so as to form one or more cells beyond the apex of the discal cells (Fig. 239, ^; these are the accessory cells. Discal Vein. â The cross vein at the outer end of the discal cell is termed the discal vein (Fig. 239, :). Patagia. â At the base of each fore wing there is a scale-like ap- pendage ; these are the patagia. The patagia correspond to the tegulse of the Hymenoptera and the elytra of the Cole- optera. In descriptions of Lepidoptera reference is often made to the palpi. These form the double beak-like projection which extends forward from the lower surface of the head. In most Lepidoptera only the labial palpi are well developed; but in some of the more generalized forms the maxillary palpi are also present. â swwawas^jsas;,^^^ The prcscncc or absence of ocelli is a character which is sometimes of considerable importance. These or- gans are situated, one on each side, above the compound eye and near its margin (Fig. 240). But it requires some skill to find them when they are present, on account of the long scales clothing the head. The Phylogeny of the Lepidoptera.âSince the general acceptance of the theory of evolutionâthat is, the theory that the higher animals and plants have been developed from lower onesâit has become evi- dent that the only sure basis for classification is a knowledge of the. Fig. 239.âWings of Notolophus 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 Comstock, John Henry, 1849-1931; Comstock, Anna Botsford, 1854-1930. joint author. Ithaca, N. Y. , Comstock Pub. Co.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectinsects, bookyear1895
