Handbook of medical entomology . loyed in the copra mills, where dried cocoanut is groundup for export, are much annoyed by mites, which yjroduce the so-calledcopra itch. The skin of the hands, arms and legs, and soinetimesof the whole body, except the face, is covered by fairly numerous, verypruriginous papules, often covered by small, bloody crusts due toscratching. The condition is readily mistaken for scabies. It isdue to the attacks of Tyroglyphus longior castellanii which occur inenormous numbers in some samples of the copra. Sarcoptidae The Sarcoptidae are minute whitish mites, semi-glo
Handbook of medical entomology . loyed in the copra mills, where dried cocoanut is groundup for export, are much annoyed by mites, which yjroduce the so-calledcopra itch. The skin of the hands, arms and legs, and soinetimesof the whole body, except the face, is covered by fairly numerous, verypruriginous papules, often covered by small, bloody crusts due toscratching. The condition is readily mistaken for scabies. It isdue to the attacks of Tyroglyphus longior castellanii which occur inenormous numbers in some samples of the copra. Sarcoptidae The Sarcoptidae are minute whitish mites, semi-globular in shape,with a delicate transversely striated cuticula. They lack eyes andtracheae. The mouth-parts are fused at the base to form a conewhich is usually designated as the head. The legs are short andstout, and composed of five segments. The tarsi may or may notpossess a claw and may terminate in a pedunculated sucker, or simplelong bristle, or both. The presence or absence of these structures SarcopiidcB, or Itch Mites 73. oOa. Sarcoptes scabiei, male.(X 100). After Fiirsten-berg. and their distribution arc much used in classification. The mites live on or under the skin of mammals and birds, where they produce the disease known as scabies, mange, oritch. Several species of the Sarcoptidaeattack man but the most important ofthese, and the one pre-eminent as theitch mite is Sarcoptes scabiei. The female of Sarcoptes scabiei, of man,is oval and yellowish white; the malemore rounded and of a somewhat reddishtinge, and much smaller. The body ismarked by transverse striae which arepartly interrupted on the back. Thereare transverse rows of scales, or pointedspines, and scattered bristles on thedorsum. The male (fig. 56) which is from 200-24oiAin length, and 150-200^ in breadth,possesses pedunculated suckers on each pair of legs except the third, which bears, instead, a long bristle. The female (fig. 56) 300-450^ in length and 2 5o-350[x in breadth, has the pedunculated sucker
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectinsectp, bookyear1915
