. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. lacks the genital organs. In certain species there is a hj'popial stage developed from the n^-naph. It is distinguished from the nymph by the absence of mouth parts, and by ha\dng long hairs, instead of a claw, at the tip of leg IV. This stage has on the venter an area of sucking disks similar to that of the hypopus of the Tyroglyphidse. The adult male is developed from the nymph. But in the case of the female there is a passage form between the n\Tnph and the true adult female. It has been called the n
. The Acarina or mites. A review of the group for the use of economic entomologists. Mites. lacks the genital organs. In certain species there is a hj'popial stage developed from the n^-naph. It is distinguished from the nymph by the absence of mouth parts, and by ha\dng long hairs, instead of a claw, at the tip of leg IV. This stage has on the venter an area of sucking disks similar to that of the hypopus of the Tyroglyphidse. The adult male is developed from the nymph. But in the case of the female there is a passage form between the n\Tnph and the true adult female. It has been called the njonphal or copulating female (femndna ac- coppiata), for it is in this stage that pairing occurs. The male mates with the n^Tuphal female, but pairing is pro- longed for several days or until the true adult is fully devel- oped within this n^onphal female. Pairing is performed through a small aperture beliind the anus and not by the vulva, which latter is not developed in the nymphal female and only appears in the adult. The o\'iduct opens by the vulva. Wlien the true female escapes from the nymphal female, an egg, already of considerable size, is seen mtliin her body. The Analgesidfc live upon birds, feeding on the feathers, epidermal scales, etc. They rarely do any damage to the birds, but are usually of service in keeping the skin and feathers clean. They remain on the host after death, often leaving the feathers and congregating on the skin. Although many of the species are now known from but one host, there are some common forms that occur on a considerable number of birds, frequently of different genera. Likewise several species of mites sometimes occur on the same bird. One species is known to occur on birds belonging to five different families. However as a rule they do not spread Fig. 247.—Caroncle of Pfero- lichus. (Author's illtis- t rat ion.). Fig. 248.—Leg oi Analgcs: 0, Olecranon process ; p, tarsal process. (Au- thor's illustration.). Please note that these i
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1915
