646 



SCABIES — SCAB — MANGE. 



Prognosis. It is difficult at present to say what importance should 

 be attached to this form of acariasis, but its existence and possible 

 consequences should be noted. 



Treatment. Some authors have recommended killing the ticks by 

 touching them with benzine, petroleum, essence of turpentine, etc., but 

 these methods do not always succeed. Applications of concentrated 

 solution of chloral are more effective. When the parasites are so large 

 as to render this possible it is better to remove them by hand, taking 

 care at the same time to remove the rostrum, which, if left in place, 

 might cause more or less suppuration. In countries where ticks are 



Fig. 264. — Ixodes ricinus. (After Eailliet.) A, Natural size ; B, ventral 

 surface ; C, dorsal surface. 



numerous and large numbers of cattle are infested, the parasites are 

 destroyed by smearing and dipping. 



(The cattle ticks of America are of especial importance in relation 

 to the disease known as Texas fever. Those who wish to study the 

 entomology of this subject are referred to the masterly account and 

 fine coloured illustrations of Salmon and Stiles, '* Cattle Ticks of the 

 United States," Ann. Kep. U.S.A. Bureau of Agriculture, 1900, p. 380.) 



HYPODERMOSIS IN THE OX (WARBLES). 



Causation. This is a parasitic disease characterised by subcutaneous 

 swellings due to the presence of larvae of the Hypoclerma bovis. The 

 larva is met with throughout Europe. It attains the perfect stage 

 during the summer, from the middle of June to the commencement 

 of September. 



