. Elements of zoölogy. Zoology. Fig. 172.—Ichneumon-fly, showing mechanism of ovipositor. with their ovipositors ; the blades of the latter divide, and the egg is forced through this channel into the wound. An abnormal growth of wood is formed about it, from which in time the perfect insect escapes. Value.—^-A decoction of certain galls, with sulphate of iron, forms the principal ingredient of ink. Ichneumon-Flies (Ichneumonidce). — These insects (Fig. 172) are re- markable for depositing their eggs in other in- sects, using for the pur- pose a long ovipositor that is protected by a sheath com
. Elements of zoölogy. Zoology. Fig. 172.—Ichneumon-fly, showing mechanism of ovipositor. with their ovipositors ; the blades of the latter divide, and the egg is forced through this channel into the wound. An abnormal growth of wood is formed about it, from which in time the perfect insect escapes. Value.—^-A decoction of certain galls, with sulphate of iron, forms the principal ingredient of ink. Ichneumon-Flies (Ichneumonidce). — These insects (Fig. 172) are re- markable for depositing their eggs in other in- sects, using for the pur- pose a long ovipositor that is protected by a sheath composed of four stylets. Rhyssa persuaso- ria bores into solid wood in search of its prey. The larva, a soft, footless grub, feeds upon its host, and when about to become a pupa spins a cocoon, from which it escapes in the adult form. Ants (Formicaria). —The ants, in the opin- ion of Sir John Lub- bock, stand next to man in point of intelligence. They erect wonderful dwellings, store up food, are agriculturists, keep and tend their cattle (Aphidce), seem to pos- sess a sign-language, go to war in organized bod- ies, and in many ways show remarkable intelligence. The. Fig. 173.—Ant's head and foot. Head : <?, e, eyes ; a, a, antennae ; m, m, man- dibles ; /, /, jaws ; t, tongue. Foot: s, spur; <r, s, comb of spur ; /c, leg- 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 Holder, Charles Frederick, 1851-1915; Holder, Joseph Bassett, 1824-1888, joint author. New York : D. Appleton and company
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
