. Des parasites animaux et la maladie humaine. Parasitologie médicale ; insectes en tant que porteurs de la maladie. LOUSE-MITE 337 aisselles ou sur les organes génitaux, est d'abord indolore et inaperçu, mais l'acarien reste attaché à la blessure d'un à trois jours avant de tomber au sol pour transformer de stade larvaire. La piqûre de l'acarien est dit de se développer en une légère blessure ou un spot dans la région de laquelle les ganglions sont gonflés et douloureux et la fièvre d'inondation suit. Les nymphes et les adultes de ce prédateur ont récemment été trouvés par.Nagayo et ses collaborateurs au Japon. La transmission de kedani par

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. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. LOUSE-MITE 337 armpits or on the genitals, is at first painless and unnoticed, but the mite remains attached at the wound from one to three days before dropping to the ground to transform to the nymphal stage. The bite of the mite is said to develop into a tiny sore or inflamed spot in the region of which the lymph glands become swollen and painful and flood fever follows. The nymphs and adults of this mite have.recently been found by Nagayo and his fellow-workers in Japan. The transmission of kedani by this mite is the only positive instance of human disease carried by Acarina other than ticks.. Other Occasionally Parasitic Species There are many species of mites, of several different families, which under abnormal circumstances or by sheer accident may become troublesome parasites of man. Nearly all mites secrete salivary juices which have a toxic effect when injected into the blood; therefore any mite which will bite man under any circum- stances may become a pest. In nearly all cases the symp- toms of attacks by mites are similar—hivelike or rashlike eruptions of the skin, in- tense itching and in severe attacks fever. Louse-Mite. — One of the most important of the occa- sionally parasitic mites is the louse-mite, Pediculoides ventricosus (Fig. 138), belonging to the family Tarsonemidse. This is a. very minute species, barely visible to the naked eye, which is normally parasitic on grain-moth caterpillars and other noxious insects, and there- fore beneficial. These mites live in stubble, stored grain and bea, ns, cotton seeds, straw, etc., attacking the various insects which infest these products and becoming numerous in pro- portion to the abundance of their prey. The female has the remarkable habit of retaining the eggs and young in her abdomen. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability

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