. A manual of zoology. Zoology. IV. INStCTA; HEXAPODA 407 honey and hence has the form of a nearly closed tube. Beside it lie the rudi- mentary paraglossoe (jig) and the well-developed palpi. Similarly the maxillae have small cardines and palpi, while the stipites and the undivided lobe (/) are long and well developed. The piercing mouth parts of the flies (Diptera) and bugs (Rhynchota) can be compared with those of the bees in so far as the labium forms the groundwork of the whole (fig. 446). The beak (rostrum, haustdlum) of these animals cor- responds to the labium; it is a grooved structure
. A manual of zoology. Zoology. IV. INStCTA; HEXAPODA 407 honey and hence has the form of a nearly closed tube. Beside it lie the rudi- mentary paraglossoe (jig) and the well-developed palpi. Similarly the maxillae have small cardines and palpi, while the stipites and the undivided lobe (/) are long and well developed. The piercing mouth parts of the flies (Diptera) and bugs (Rhynchota) can be compared with those of the bees in so far as the labium forms the groundwork of the whole (fig. 446). The beak (rostrum, haustdlum) of these animals cor- responds to the labium; it is a grooved structure, either fleshy and flexible, or. /ZTn Fig. 446. Fig. 447. Fig. 446.—Sucking mouth parts o£ mosquito, Culex pipiens (after Muhr). The groove of labium opened by removing lab rum; the stylets separated. Fig. 447.—Sucking mouth parts of a butterfly (after Sa\dgny). ', mx", shows how right and left unite into a tube; right labial palpus (pi) with hairs removed. stiff and jointed. The edges of the groove are inrolled so that there remains a narrow dorsal slit, which can be closed by the slender upper lip ilr). The tube formed of these parts contains four stylets, toothed or with retrorse hooks at the tip. These are the mandibles and maxillae, and a fifth stylet, the hypo- pharynx (hy) can be present. The palpi, which only occur in the Diptera, belong to the maxillae (p). Reduction in number of stylets to four or three, or their complete absence (some flies), is brought about by fusion or by degeneration. The haustellum serves as a case for the sucking tube, which in the Rhynchota is formed by the united maxillce, in the Diptera by labrum and hypopharynx. The proboscis, or haustellum (the so-called tongue), of the Lepidoptera. 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 Hertwig, Richard,
Size: 1663px × 1502px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
