. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 2/ Fig. 172.— Uroplitella: a, Anal plate; c, camero- Fig. 173.— Uropoda: Caroncle and stome; g, genital plate; p, perigenital plate; peritreme. (Author's illustra- m, marginal plate; s, spiracle and peritreme; tion.) fjventral plate; /, foveae; I, coxa I; II, III, 7F, coxal cavities. (Original.) 1. Venter provided with impressed foveae for the reception of the legs 2 Venter without such fovese 6 2. Leg I without claws, ending in bristles 8 Leg I with claws, and caroncle, at tip 4 3. Body about as broad
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. 2/ Fig. 172.— Uroplitella: a, Anal plate; c, camero- Fig. 173.— Uropoda: Caroncle and stome; g, genital plate; p, perigenital plate; peritreme. (Author's illustra- m, marginal plate; s, spiracle and peritreme; tion.) fjventral plate; /, foveae; I, coxa I; II, III, 7F, coxal cavities. (Original.) 1. Venter provided with impressed foveae for the reception of the legs 2 Venter without such fovese 6 2. Leg I without claws, ending in bristles 8 Leg I with claws, and caroncle, at tip 4 3. Body about as broad or broader than long; dorsum smooth Cilliba. Body longer than broad; dorsum sculptured or roughened Discopomn. 4. A perigenital scutum around the genital plate Uroplitella No perigenital scutum : :_) 5. Dorsum smooth or punctured, not sculptured Uropoda. Dorsum roughened or sculptured i • 6. Leg I without claws 7 Leg I with claws S 7. Legs with scalelike hairs; dorsal and ventral plates separate and dis- tinct Polyaspis. Legs without such hairs; no ventral plate Uroseius. 8. Dorsum covered by one plate fused to the ventral plate; peritreme sinuate; anterior coxae contiguous Dinychus. Dorsum with several plates not fused to the ventral plate; peritreme but little curved; anterior coxae separate Trachytes. 9. The anterior part of body, or hood, distinctly separated from the rest of the body by a suture Cephalouropoda. The anterior portion not separated by a suture Trachyuropoda. But few species have been described from this country, although they are extremely common and easily obtainable, and their habits are as interesting as those of any of the acari. Most of the species are found in decajdng matter, as manure, rotton logs, fallen leaves, usually where insects are l)reeding, ha\'ing been carried to the place by these insects. Uropoda (figs. 173, 174,175) may be divided into two sub- genera— Uroobovella, in which tlie anal plate is more or less distinct from the ventral
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1915
