An Account of the Insects Noxious to Agriculture and Plants in New Zealand: The Scale-insects (Coccididae)

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Didsbury, 1887 - Beneficial insects - 116 pages
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Page 57 - Mytilaspis pomorum, is usually greenish white, and bears rudimentary antennae. There are eight groups of spinnerets: four, consisting each of twenty to thirty, are placed in opposite pairs; the fifth, consisting of four to six, is between the upper pair; above these, three other groups form an arch; the two outer ones consist of eight to ten, and the mesal one of three to five. The male insect is of a bright scarlet or deep orange color. This is a New Zealand species which infests a Veronica and...
Page 9 - This secretion drops from them on to the plant, and from it grows a black fungus, which soon gives an unsightly appearance to the plant. This fungus or 'smut' is an almost invariable indication that a plant is attacked by insects, and may, indeed, give a useful warning to treegrowers.
Page 105 - ... hairs in each. Amongst the hairs in the tufts are several protruding tubular spinnerets, having on the outer end a kind of multiglobular ring or crown ; from these proceed cylindrical, glassy, straight tubes as long as the tufts of hair. Long, fine, glassy, delicate filaments, as long as the body of the insect, radiate from the edge all round ; but these, being very fragile, are often irregular, or absen During gestation thick, short, cottony processes form at the edge of the thorax, seemingly...
Page 93 - ... in color. When the male larva is ready to undergo his metamorphoses, he secretes a covering to his body resembling the sac excreted by the female, except that it is very much smaller, measuring only 1.33mm. (.05 inch) in length (Fig. 1). From this sac the adult insect emerges as a delicate fly-like creature, with two large wings and a pair of long waxen filaments projecting from posterior part of the abdomen; these filaments are very conspicuous, being white and longer than the body of the insect.
Page 104 - Adult female dark reddish-brown, covered with a thin powdery secretion of yellowish meal, and with slender glassy filaments; stationary at gestation, and gradually raising itself on its head, lifting the posterior extremity until nearly perpendicular, filling the space beneath it with thick white cotton, which gradually extends for some distance behind it in an elongated, white ovisac, longitudinally corrugated; ovisac often much longer than the insect, and becoming filled with oval red eggs. Length...
Page 43 - The scale is brown, somewhat convex, the underside white. The female in the middle is bright yellow. There are four groups of spinnerets: the cephalo-laterals consist each of ten, the caudo-laterals of nine. The abdomen ends in six lobes, of which only the two median are conspicuous; between the lobes serrated plates. 36. Aspidiotus epidendri Bouche.
Page 52 - M. citricola, being much smaller than that of the female, straight or nearly so, with a single molted skin, and with the posterior part joined to the remainder of the scale by a thin portion which serves as a hinge.
Page 83 - Lecanmm hesperidum, but the formation of the white ovisac is a clearly distinguishing character. In late summer the female often drops off to the ground, leaving only the ovisac observable on the leaf.
Page 106 - ... Abdomen slender, segments somewhat distinct ; on each segment some hairs; the last segment ends in two thick, conspicuous, cylindrical processes, which, in side view, are seen to incline upwards, and beneath them is the short, conical spike sheathing the penis. Penis red, longish, tubular, and thick, with many recurved short hairs, and at the end a ring of short spines. Each of the two processes on the last segment bears three or four long...
Page 105 - Body previous to gestation lying flat on the plant, the edge slightly turned up; on the dorsum a longitudinal raised ridge, forming one or more prominences. Insect covered all over with numerous minute fine hairs, most thickly on the thoracic region; round the edge these hairs are longer, and are arranged in tufts somewhat closely set; the tufts are black, and contain from twenty to thirty hairs in each.

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