as affectuu) Domesticated Animals. G3 



or to travel from one animal to another. Hence we find that some 

 animals will be affected and others not, although they are all herd- 

 ing together, and are necessarily fed and managed the same. On 

 the approach of spring, however, the ejnzoa lose their inactivity, 

 become more prolific, travel to other parts of the body, and pass 

 freely from one animal to another. Evidence of this changed 

 state of things is soon afforded by the irritation which they pro- 

 duce, leading the cattle to rub themselves bare in many places, 

 particularly about their shoulders and buttocks. This nude state 

 of skin is not unfrequently the first thing to attract the attention 

 of the owner, and lead him to a knowledge of the fact that the 

 animal is lous}'. 



The Hcematopinus Boris is larger than his congener of the 

 horse, and darker in colour, being usually of a deep brown hue. 

 The depth of its colour will, however, depend very much on the 

 amount of blood it contains. It remains firmly fixed by the 

 insertion of its sucker into the skin for so long a time together, 

 thfit it would appear to use this organ for the purpose of holding 

 on, even after its digestive system is filled with blood. 



Trichodectes Bovis. — We here give an illustration of this louse, 

 not only to show its peculiar form, but as 

 a type of the genus as occurring among 

 domesticated animals. Its broad head and 

 pale or yellowish colour at once serve to 

 distinguish the parasite, no matter upon 

 what part of the body, or upon what ani- . x 



mal it may exist. ^i-v^' \ 



We have met with these lice in great 04% 

 abundance upon young cattle — yearlings \ 



in particular — and especially those that 



had been badly kept after being weaned. i^ 



Such animals are generally low in flesh, 1^?- 



and have a most unhealthy appearance. . i3 



They suffer much cutaneous irritation, and 1 



are so unthrifty that all the food given 

 them seems to be of no avail in improving ^r 



their condition. It is also during the win- , - ^, 



ter half of the year that these lice abound ; Trichlkctes Bovis. 



and it is usually in the spring, from their Mao-nified. 



rapid increase, that attention is given to 



rid the animals of them. No part of the .body is exempt from 

 their attack, and very often an animal will be covered all over 

 with the parasites, causing him to rub and lick himself so con- 

 tinuously as to produce extensive excoriations of the skin. 



When these lice are present in no very large numbers, 

 some persons trust to the shedding of the coat as the spring 



