. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. -fSeia£,^ A/and/ii/e a/id /iaxiHoe. Beak of hemipteron. to form an organ for piercing and sucking. This is well shown by the accompanying illustration (fig. i6). The upper lip, or labrum, is much reduced and immovable, the lower lip, or labium, is elongated to form a jointed sheath, within which the lance-like mandibles and maxillae are enclosed. The mandibles are more or less deeply serrate, depend- ing on the species concerned. The poison is elaborated by the salivary glands, excepting, poss
. Handbook of medical entomology. Insect pests; Insects as carriers of disease; Medical parasitology. -fSeia£,^ A/and/ii/e a/id /iaxiHoe. Beak of hemipteron. to form an organ for piercing and sucking. This is well shown by the accompanying illustration (fig. i6). The upper lip, or labrum, is much reduced and immovable, the lower lip, or labium, is elongated to form a jointed sheath, within which the lance-like mandibles and maxillae are enclosed. The mandibles are more or less deeply serrate, depend- ing on the species concerned. The poison is elaborated by the salivary glands, excepting, possi- bly, in Belostoma where Locy is inclined to believe that it is secreted by the maxillary glands. The salivary glands of the Hemiptera have been the subject of much study but the most recent, comprehen- sive work has been done by Bugnion and PopofE, (1908 and 1910) to whose text the reader is referred for details. The Hemiptera have two pairs of salivary glands: the 'primary gland, of which the efferent duct leads to the salivary syringe, and the accessory gland, of which the very long and flexuous duct empties into the primary duct at its point of insertion. Thus, when one observes the isolated primary gland it appears as though it had efferent ducts inserted at the same point. In Nepa and the Fulgoridcs there are two accessory glands and therefore apparently three ducts at the same point on the primary gland. The ensemble differs greatly in appearance in different species but we shall show here Bugnion and Popoff's figrnre of the apparatus of Notonecta ^^' s^HvYi^^pumr'oTFui- 'fnaculata, a species capable of inflicting a painful rugnrn^^dPopoff!" bite on man (fig. 17).. 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 Riley, William A. (William Albert), b. 1876; Johanssen, Oskar Augustus, 1870-. Ith
Size: 934px × 2677px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1915
