. La Acarina o ácaros. Un examen del grupo para el uso de los entomólogos económicos. Los ácaros. La ACAEINA o ácaros. 127-ioiiited tliree. Las mandíbulas son el quelato comúnmente, pero muy pequeño. La abertura genital está ubicado entre la tercera y cuarta coxae, y el ano en la punta del cuerpo. Los machos, que son generalmente de una forma diferente que las hembras, tienen un par de retoños copulador cerca de la punta, Venter. Estos ácaros se alimentan de los pelos de pequeños mamíferos, y cada género tiene algunos aparatos especiales donde- con para sujetar el cabello. En Listrophorus bajo el labio se expande en cada sid

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. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. THE ACAEINA OR MITES. 127 tliree-ioiiited. The mandibles are commonly chelate, but very small. The genital aperture is situate between the third and fourth coxae, and the anus at the tip of the body. The males, which are usually of a different shape than the females, have a pair of copulatory suckers near the tip of the venter. These mites feed on the hairs of small mammals, and each genus has some special apparatus where- with to hold onto the hair. In Listrophorus tHe under lip is expanded on each side into a flexible plate which curls around the hair. They occur on rabbits, squirrels, and mice. In Myocoptes (fig. 262) the hind pairs of legs are enlarged, the apical joints proT.ded with a few large spurs, and these joints can fold back on the basal joints, as a knife blade. By this arrangement they cling to the hair of mice. In Trichoecius the liind tarsal joint is flattened, curved, and proT.ded with a spine, which enables the mite to grasp the hair of mice. In Labidocarpus, which occiu-s on bats, the anterior legs are very short and the last joint enlarged and concave below; by these they clasp hairs. The hind legs are normal. Schizocarpus has a similar arrange- ment; it occurs on the beaver. In Chirodiscus the anterior legs have the apical joints flattened and curled, but destitute of claws and sucker. Each species is restricted to one or two hosts, as the clasping apparatus is fitted to hold a hair of a certain diameter and can not hold to hairs much smaller or greatly larger than those of its normal host. Little is known regarding their life history. In Labidocarpus the male mates with a n^Tnphal female (as in the true Analgesidse), which molts, and the true female issues only to deposit eggs. Some species of Listrophorus are preyed upon by species of Cheyletus that use the rabbit's fur as a hunting forest. This family is based on the pilicolous habit and the possess

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• bookcentury1900
• bookdecade1910
• bookpublisherwashi
• bookyear1915