. Parasites and parasitosis of the domestic animals : the zoo?logy and control of the animal parasites and the pathogenesis and treatment of parasitic diseases . Domestic animals. THE TICKS 141 Ear Tick, Argasidse (p. 139).—The body is oval, broader anteriorly than posteriorly. The female is 5-6 mm. (3^ of an inch) in length and about 3 mm. {^/s of an inch) in breadth. The nymphs are co^'ered with nu- merous spines, a fact which has given to this species the common name "spinose ear ; Occurrence and Habits.—This tick occurs in the ears of horses of Mexico and the Southwestern St
. Parasites and parasitosis of the domestic animals : the zoo?logy and control of the animal parasites and the pathogenesis and treatment of parasitic diseases . Domestic animals. THE TICKS 141 Ear Tick, Argasidse (p. 139).—The body is oval, broader anteriorly than posteriorly. The female is 5-6 mm. (3^ of an inch) in length and about 3 mm. {^/s of an inch) in breadth. The nymphs are co^'ered with nu- merous spines, a fact which has given to this species the common name "spinose ear ; Occurrence and Habits.—This tick occurs in the ears of horses of Mexico and the Southwestern States. Its attack is not confined to horses and mules; it also attacks the ears of cattle and occasionally other domestic animals and man. The larval ticks reach the head of the graz- ing host animal from weeds or other vegetation upon which they have crawled immediately after hatching. Having gained en- trance to the ear, they attach deeply in the folds where they feed for about five days. They then molt and, as nymphs with spinose bodies, continue to infest the ear and feed for several weeks. The nymphs then leave the host, again molt, and becoming unspined adults, the females are fertilized and soon begin depositing their eggs. Effect.—In their attach- ment to the lining of the conchse the spinose ticks cause much'irritation which the animal indicates by shak- ing its head, or it may be wrought up to a high degree of nervous Fig. 80.—Otobius megnini: dorsal and ventral view of nymphal form, with details (after Osborn, from Marx, Bull. No. 5, Bureau of Entomology, U. S. Dept. of Agr.). The ticks are said to be responsible for much deafness among domestic animals, and, especially among young animals, they are considered as a cause of se- rious illness and even death. Treatment.—Good results have been obtained by flooding the ear with carboKzed oil. This closes the breathing apertures of the ticks and causes them to release their attachment, after which th
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