. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 66 REPORT 108, U. S. DEPARTMENT OF Fig. 124.—Shield of nymph oi Ambly- omma. (Original.) ings for several feet, molts, mates, and then begins to oviposit, placing her eggs in a crevice. The mother then dies. The lan-se, upon hatching, remain in a bunch until an opportunity for attachment occurs, when they seek the ear of their host. The first molt is passed on the host, and the nymph often remains attached for a longtime. The female, if she does not find a mate, may live for at least 18 mo
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 66 REPORT 108, U. S. DEPARTMENT OF Fig. 124.—Shield of nymph oi Ambly- omma. (Original.) ings for several feet, molts, mates, and then begins to oviposit, placing her eggs in a crevice. The mother then dies. The lan-se, upon hatching, remain in a bunch until an opportunity for attachment occurs, when they seek the ear of their host. The first molt is passed on the host, and the nymph often remains attached for a longtime. The female, if she does not find a mate, may live for at least 18 months. Specimens kept in pill-boxes have pro- duced slight tapping sounds. The Ixodidae, or true ticks, are represented by a large number of species in tropical countries, but in the temperate regions they are much less common. However, there are about 40 species in the United States, and one of these, the Texas cattle tick, is a pest of prime importance. Various classifications of the Ixodidae have been presented by a variety of authors, most of whom relied on the comparative length of the palpi as a primary character. This, however, is not sufficiently different to be easily recognized; Lahille based a classification mostly on sexual characters, as the presence and number of ventral plates in the male. The following arrangement is more satisfactory, and applies also to the nymphs: 1. Venter showing a curved groove (fig. 106) a short distance in front of the anus, and extending back each side to the hind margin; no posterior mar- ginal festoons; stigmal plate nearly circular; no ocelli; hind coxae of male not enlarged 2 Venter sho^ving more or less distinctly a curved groove behind the anus, but none in front of it; the male with distinct marginal festoons, more or less distinct in the female 4 2. Legs longer than body; tarsi six to ten times as long as broad; coxae I hardly spinose;onbats Haemalastor. Legs shorter; tarsi much shorter; coxae I usually with spine or process be
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