. Economic entomology. Beneficial insects; Insect pests; Thysanura. 212 ARACHNOIDEA, CASE phora) have been ascertained to have a similar structure to that XIII. ^ ' of the young of the family to which the cheese mites belong (Acaridae). They differ, however, in having no vesicle attached to their feet, but they correspond with a portion of them, in having a remarkable breathing apparatus, consisting of two tubes, which open on the back part of the thorax, adding another to the different variations in the mode of breathing in insects. This may be seen in the accompanying woodcut of the cephalot
. Economic entomology. Beneficial insects; Insect pests; Thysanura. 212 ARACHNOIDEA, CASE phora) have been ascertained to have a similar structure to that XIII. ^ ' of the young of the family to which the cheese mites belong (Acaridae). They differ, however, in having no vesicle attached to their feet, but they correspond with a portion of them, in having a remarkable breathing apparatus, consisting of two tubes, which open on the back part of the thorax, adding another to the different variations in the mode of breathing in insects. This may be seen in the accompanying woodcut of the cephalothorax of one of them (Damgeus auritus). They are also furnished with curious appendages, such as plates or lamellje, and differently formed hairs and tu- bercles on different parts of the body. They have no eyes. As already said, for a long time the two singular breath- ing apertures near the posterior angles of the cephalothorax', were supposed to be eyes, but now that the function of sight has been found not to belong Head of Damaeus auritus, showing . .1 1 • 1 r 1 . a breathing pores and lateral projec- tO thCm, ttOtlimg ClSC Of thC natUrC Of tions. Copied from Nicolet. eyes has been discovered in their place. They have tarsi bearing one, two, or three claws, according to the species, but no suckers in any. Their development has been traced in many species from the egg. The young larvae are hexapod when hatched. Authorities are not at one as to whether these insects should be classified as hurtful or not. M. Nicolet, who has monographed the Oribatidas found in the neighbourhood of Paris, says that they never cause any damage either to man or the products of his industry, but Mr. Curtis classes at least one of them as hurtful to fruit trees. In one respect, in which he differs from Nicolet, he certainly is right. Nicolet says that they are essentially vagabond and solitary, inhabiting the moist mosses in forests and the sheltered banks of waters, that they are found sometim
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