. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 128 EVENINGS AT THE MICROSCOPE. for the deposition of the eggs, and is hence called an ovipositor, though in many cases it performs a part much more extensive than the mere placing of the ova. In the large tribe of Cuckoo-flies (Ichneumonidm) which spend their egg and larva states in the living bodies of other insects, this ovipositor is often of great length ; even many times longer than the rest of their bodies ; for the larvse which have to be pierced by it req
. Evenings at the microscope : or, Researches among the minuter organs and forms of animal life . Zoology; Microscopy; Microscopes. 128 EVENINGS AT THE MICROSCOPE. for the deposition of the eggs, and is hence called an ovipositor, though in many cases it performs a part much more extensive than the mere placing of the ova. In the large tribe of Cuckoo-flies (Ichneumonidm) which spend their egg and larva states in the living bodies of other insects, this ovipositor is often of great length ; even many times longer than the rest of their bodies ; for the larvse which have to be pierced by it require to be reached at the bottom of deep holes and other recesses in which the providence of the parent had placed them for security. The structure of the organ may be seen in this little species, not more than one-sixth of an inch in entire length, of which the ovipositor projects about a line. Under the microscope you see that this projection consists of two black fleshy filaments, rounded without and flattened on their inner faces, which are placed together, and of the true implement for boring, in the form of a perfectly straight awl, of a clear amber hue, very slender, and brought to an abrupt oblique point, where there are a few exceedingly fine reverted teeth. It is probably double, though it refuses to open under the pressure which I bring to bear upon it. At the base are seen within the semi-pellucid abdomen the slender horns, on which the muscles act in projecting the borer. You are doubtless aware that the little berries which. GALL-FLY, AND MECHANISM OF OVIPOSITOR. look like bunches of green currants, often seen growing on. 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 Gosse, Philip Henry, 1810-1888. London : Society for Promoting Christian Knowledge
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