. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 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 similarâhivelike or rashlike eruptions of the skin, in- tense itching
. Animal parasites and human disease. Medical parasitology; Insects as carriers of disease. 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 similarâhivelike or rashlike eruptions of the skin, in- tense itching and in severe attacks fever. Louse-Mite. â 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. Fig. 138. Louse-mite, Pediculoides ventri- cosus ; 5 â unimpregnated female; $, male, X 150. (9., after Brucker from Webster; $ , after Banks.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chandler, Asa Crawford, 1891-. New York, J. Wiley
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