Handbook of medical entomology . d theanal opening is on the venter. The female attains alength of about Last segment of the palpus forms a thumb to the preceding, whichends in a claw (with few exceptions); body often with mam^ hairs (fig. 158 k) .TROMBIDOIDEA. g. Legs I and II with processes bearing spines; skin with several shields; coxae contiguous Cmcvi^idje. gg. Legs I and II without such processes; few if any shields. h. Palpi much thickened on the base, moving laterally, last joint often with two pectinate bristles; no eyes; legs I ending in several long hairs; adult sometime
Handbook of medical entomology . d theanal opening is on the venter. The female attains alength of about Last segment of the palpus forms a thumb to the preceding, whichends in a claw (with few exceptions); body often with mam^ hairs (fig. 158 k) .TROMBIDOIDEA. g. Legs I and II with processes bearing spines; skin with several shields; coxae contiguous Cmcvi^idje. gg. Legs I and II without such processes; few if any shields. h. Palpi much thickened on the base, moving laterally, last joint often with two pectinate bristles; no eyes; legs I ending in several long hairs; adult sometimes parasitic CHEYLETIDiE Cheyletus eruditus, which frequents old books, has oncebeen found in pus discharged from the ear of Palpi less thickened, moving vertically; eyes usually present;leg I not ending in long hairs,i. Cox£e contiguous, radiate; legs slender, bristly; body with few hairs; no dorsal groove; tarsi not swollen Erythr^id^. ii. Coxa; more or less in two groups; legs less bristly. 272 Hontinoxious Arthropods. (a) Tydeus, beak and leg from below; (6) Cheyletus pyriformis, beak and palpus;(c) beak and claw of Pediculoides; (d) leg of Sarcoptes; (e) scutum offemale of Amblyomma americana; (/) leg i and tip of mandible of Histio-stoma americana; (g) Histiogaster malus, mandible and venter; (h) Aleuro-bius farinae. and leg i of male; (t) Otodectes cynotis, tip of abdomen of male,ij) beak and anal plate of Dermanyssus gallinae; {k) palpus of AUothrom-bium. (a) to ij) after Banks. A carina 273 j. Body with fewer, longer hairs; often spinning threads;no dorsal groove; tarsi never swollen; mandibles styliform (for piercing) Tetranychid^ The genus Tetranychus may be distinguished from the other genera occurring in the United States by the following characters: No scale-like projections on the front of the cephalothorax; legs I as long or longer than the body; palp ends in a distinct thumb; the body is about times as long as broad. T. molestissimus Weyenb. from So
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1915
