. Agricultural zoology. Zoology. 122 ZOOLOGY. The Dragon Flies (Libellulidoe) fly about inces- santly from place to place on bright warm days, and catch a large number of insects, especially butterflies and flies, among which are many that are harmful. The larvae live in water, and feed on insects and such small deer, which, however, are of no importance to forestry or agriculture. They also devour fish-spawn, and may therefore be injurious in that way. The lace Flies (Hemerohidce) when at rest are covered as with a roof by their fore and hind wings, which are almost alike, clear as glass, and
. Agricultural zoology. Zoology. 122 ZOOLOGY. The Dragon Flies (Libellulidoe) fly about inces- santly from place to place on bright warm days, and catch a large number of insects, especially butterflies and flies, among which are many that are harmful. The larvae live in water, and feed on insects and such small deer, which, however, are of no importance to forestry or agriculture. They also devour fish-spawn, and may therefore be injurious in that way. The lace Flies (Hemerohidce) when at rest are covered as with a roof by their fore and hind wings, which are almost alike, clear as glass, and finely veined. Head tolerably large, eyes large, abdomen elongated and slender. The extremely rapacious larvse (Fig. 86, b) feed on the juices of the bodies of other insects, which they suck up by means of a. (If 1} Fig. 86.—The Common Lace Fly (Chrysnpa vulgaris): a, eggs; b, the larva; c, cocoon; (2. pupa contained in the same; e, open cocoon ;,/*, adult Insect; a, c, e, natural size; d, enlarged and natural size; b and/ enlarged. pincer-like organ situated on either side of the mouth. The two pincers are perforated, and the tubes open on each side into the gullet; the body juices of the insects attacked thus flow into the gut of the larva. This is strongly built, and always much thicker and larger than the adult insect. Metamorphosis com- plete. Three genera belong to the lace flies :— 1. The delicate greenish, or greenish yellow, ill- smelling Gold-eyed Lace Flies (Ghrysopa), the larvse of which chiefly feed on plant lice (a few species on caterpillars, also, and other small insect larvae). 2. The Aphis Lions {Hevierobius: H. hirtus, with. 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 Bos, Jan Ritzema, 1850-1928; Ainsworth Davis, J. R. (James Richard), 1861-1934. London, Chapman & Hall, Ld.
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
