. Economic entomology. Beneficial insects; Insect pests; Thysanura. 3o6 ARACHNOIDEA. ^^ A full description, with careful figures, will be found in the Bulletin of the Society of Moscow, i860. It is a very flat, broad species; and the absence of spines on the back at once distinguishes it. Sarcoptes mutans, side view. Copied from Robin. from all the preceding. The ailment produced by it, is observed most frequently on the hen and the cock, appearing first on the feet, on the comb, and about the beak. No premonitory symptoms indicate its approach. The fowls preserve their appetite and live- line
. Economic entomology. Beneficial insects; Insect pests; Thysanura. 3o6 ARACHNOIDEA. ^^ A full description, with careful figures, will be found in the Bulletin of the Society of Moscow, i860. It is a very flat, broad species; and the absence of spines on the back at once distinguishes it. Sarcoptes mutans, side view. Copied from Robin. from all the preceding. The ailment produced by it, is observed most frequently on the hen and the cock, appearing first on the feet, on the comb, and about the beak. No premonitory symptoms indicate its approach. The fowls preserve their appetite and live- liness ; although sometimes a careful observer may see that the sick animals shake their heads, raise and stretch their legs in a convulsive manner. If the examination is followed up, some white points and lines traced in zigzag, covered by very small scales, which the least rubbing knocks off, may be seen on the comb. The skin, covered by them, is lightly chagrined and of a brown colour, which contrasts with the red colour of the rest of the comb. At that period no lesion of the tissues is observable. The malady remains stationary for fifteen days or even a month, at the end of which time the base of the comb thickens and becomes darker, and the linear tracings assume the appearance of true burrows of the itch insect, and at the bottom of them the Sarcoptes mutans is to be found. At a later period the feathers of the head and about the beak undergo a remarkable change : they turn back, stand on end,. 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 Murray, Andrew, 1812-1878. [London] Chapman and Hall
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