. Un texte-livre de zoologie agricole. Zoologie, économique. Les acariens OU LES ACARIENS. 109 doit contenir du soufre dans une certaine forme, comme c'est le plus puissant des acaricides. Foie de soufre est jugée être la meilleure forme. Le genre, qui Bryohia Trombididse appartient à la récolte ou d'acariens, a une espèce nuisible aux arbres fruitiers. Son petit, rond, rouge vif des oeufs peuvent souvent être vu portant sur l'écorce de prune et d'Apple pendant les mois d'hiver. Plusieurs autres se produisent de manière similaire à attaquer des fruits et des fleurs. Dans cette famille est également placé la récolte Bug (Leptus autumnalis), fig. 43. Cet acarien est larvaire a dit à b

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. A text-book of agricultural zoology. Zoology, Economic. ACARINA OR MITES. 109 must contain sulphur in some form, as that is the most powerful acaricide. Liver of sulphur is found to be the best form. The genus Bryohia, which belongs to the Trombididse or Harvest Mites, has a species destructive to fruit-trees. Its small, round, bright-red eggs may often be seen covering the bark of plum and apple during the winter months. Several others occur in a similar way attacking fruit and flowers. In this family is also placed the Harvest Bug (Leptus autumnalis), fig. 43. This larval mite is said to be the young stage of Tromhidium holosericeum (fig. 41). T. holosericeum is a scarlet mite with a squarish body covered with hairs and papillse, about the twelfth of an inch in length. This mite, which is found crawling about upon the ground, deposits eggs in July. These ova hatch into minute, • six-legged, orange-coloured larvae, the so-called Harvest Bug, which lives as a parasite on the skin of man and many animals, and produces violent itching. When full grown the Harvest Bug is only ^mm. long. Family Gamasidae.—In this family the mandibles are pro- vided with very small nippers. They are found on the ground and as partial parasites. The legs are seven-jointed, the second pair being often larger than the rest. There are two claws to the tarsi. The colour is generally light brown, or white; some are reddish, owing to the blood drawn from their host. The most important form is the Eed Hen Mite (Dermanyssus avium), which in- fests fowls and almost aU birds (fig. 44) This mite, described by Eedi, may be ^^^^^-^U-d"S found in all unclean hen-roosts and (greatly enlarged), pigeon-houses. It is provided with a sharp piercing mouth. It is a small mite, flattened, with bristly abdomen and stoutish hairy legs. In colour this gamasid varies from pale yellow to dark red. The larvse, which hatch rapidly from the eggs, are white and six-legged. Like many. Please note that these i

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• bookcentury1800
• bookdecade1890
• booksubjectzoology
• bookyear1899