. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. THE ACAEIXA OR MITES. 63. Some writers have elevated the ticks to a position higher than a family or super- family; usually to a suborder; thus Marx called *hem Cynorhaestea, and LahiUe Arpa- gostoma, while Koch and others have designated them an order, Ricini. Their rela- tionship to the Parasitoidea is such that they should not rank higher than a superfamily. The Ixodoidea are readily diT.ded into two families: No scutum; no ventral shield; mouth parts of adult not prominent from above; no pulvillus
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. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. THE ACAEIXA OR MITES. 63. Some writers have elevated the ticks to a position higher than a family or super- family; usually to a suborder; thus Marx called *hem Cynorhaestea, and LahiUe Arpa- gostoma, while Koch and others have designated them an order, Ricini. Their rela- tionship to the Parasitoidea is such that they should not rank higher than a superfamily. The Ixodoidea are readily diT.ded into two families: No scutum; no ventral shield; mouth parts of adult not prominent from above; no pulvillus to tarsus in adults; stig- mal plate between coxae III and IV Argasid.e. Scutum present; sometimes ventral shields; mouthpartsof adult prominent from ^'^t^-'£J^' "-^ -i^ ^- above; pulvillus to tarsus of both ^^^^^ j ^^ *^' ~ ^S^ adults and young; stigmal plate be- rj* *" hind coxae Ixodid^. ^' The Argasidae, containing but few genera, are #^/1 ».~, ^ * in some ways intermediate between the true ticks w^ A » f j-';'"^ - % (Ixodidae) and the Dermanyssidae. The skin is jiV^^ 1 "^ ' usually covered with granulations or deeply pit- ^-^ ^^ ^ ted, and the head and mouth parts are hidden , f -^ W. >i - ^- beneath the anterior part of the body. They are W^ vy^^:&?&r ? nocturnal in habit and feed on the blood of mam- mals (including man) and bii'ds. Unlike the true ticks, the females of this family do not become ^, , . ^ 1 1 -^1 1 1 ^ mi o^i Fig. 117.—Dermacmfor aZfejpjcitts; Male, so greatly distended with blood. There are three (Original) genera and two subgenera in our fauna. 1. Margin of body thin and acute Argas. Margin of body rounded 2 2. Body with many short stiff bristles; mouth parts weak and indistinct Otobius. Body without bristles; mouth parts well developed Ornithodoros Argas has two subgenera as follows: 1. Body as broad or broader than long Carw. Body much longer than broad Argas. Ornithodoros may also be divided as follows: 1. A latera