Ticks. Laniinosioptes Cysticola. 



979 



Ixodes reduvius, parasitic on slieop and t'attle, now and then also on dogs, 

 in the latter animals the tick, the larva or the nynipha' bore iirnily into the skin. 



Ixodes bovis (Margaropns annulatus, Boophihis bovis, Ehipicephalus aunulatus, 

 cattle tick) causes inflammation of the skin and leads to the formation of nodules in 

 the skin. 



Besides these a number of ticks occur at times in the domestic animals, which 

 like the latter have a practical importance, especially in the transmission of piroplas- 

 mosis, and, according to their development are divided into four groups (see Vol. I). 



The removal of ticks from the bodies of domestic animals 

 is best brought about by moistening with salt water, oil of tur- 

 pentine, benzine, petroleum, carbolic oil or simply with fatty 

 oils; but they may be removed by cautious regular extraction 

 Avithout these remedies. By forci))le traction the mouth portion 

 may be left behind and cause suppuration or extensive derma- 

 titis, especially in horses and dogs. 



tc^^^i:^ > ' M ,<> 



Fig. 157. Dermanyssus avium. Female, on the left from the back, on the right from 

 the abdominal side; in the middle an egg. Magnif. 75. (After Megnin.) 



2. Laminosioptes cysticola. (Sarcoptes cysticola.) It is 

 a minute parasite with longish body, eight legs, and two long 

 bristles on the hind end of the Ijod}^ The parasites live on the 

 skin of fowls, turkeys, pheasants, etc., and chiefly in the sub- 

 cutaneous cellular tissue of old animals, where they develop 

 millet-sized nodules which later on become chalky. If they are 

 limited to the surface of the skin only, desquamation is pro- 

 duced. They cause the animal to fall away in condition if they 

 are present in very large numbers. 



3. Dermanyssus avium. (Fowl mite.) It is yellowish white, 

 blood red if gorged with blood, readily visible to the naked eye, 

 with four pairs of legs at the thorax (Fig. 157). It lodges by 

 day in the crevices of fowl houses or stables, in cages and the 



