658 DISEASES OF CATTLE, SHEEP, GOATS, ETC. 



name of Pediculus setosus probably preceded the description by 

 Nitzsch under the name which the insect has borne since 1818. 



Probably every one who has had much to do with dogs is aware 

 to what an extent this parasite may multiply and how troublesome 

 it is to this friend of man. It is generally believed that the lice are 

 more troublesome to puppies than to old dogs, and it is not at all un- 

 likely that the insects migrate when possible from older to younger 

 animals. 



In color this species agrees pretty closely with the other species 

 and it is of about the same length as the cat louse, a little more than 

 one millimetre, but it is much broader in proportion, being more 

 than half as wide as long, and the head is short and the front but 

 slightly curved. 



THE LOUSE OP THE CAT (TRICHODECTES STJBROSTRATUS) . 



While it is possible that this parasite was referred to by Otto 

 Fabricius about the year 1780 under the name of Pediculus canis, 

 the first certain reference to it appears to have been the description 

 by Nitzsch in 1818. Since that time it has been referred to by nearly 

 all writers on the common parasites of animals, but so far as we know 

 there has been no special description of the different stages, and we 

 must assume that there is no important departure from the habits of 

 species that are more thoroughly known. 



It is a little more than a millimetre in length and has much the 

 appearance of the species occurring on other domestic animals, but 

 is distinguished particularly by the form of the head, which is quite 

 pointed, and the under part of the front of the head is hollowed out 

 in a furrow about the size of a hair. The insect will often be found 

 adhering by the mouth parts with a hair so closely held in this groove 

 that it is somewhat difficult to tell where the hair begins as separate 

 from the insect. 



There is no record that we have seen that indicates its presence 

 on any other animal than the domestic cat, and, it is only occa- 

 sionally that cats become infested with it. When they do the usual 

 remedies may be administered, especially a washing with kerosene 

 emulsion, after which the animal should be allowed to dry in a warm 

 place, as the fur is so fine that they dry slowly. 



ORDER PROVIDING FOR THE INSPECTION AND QUARANTINE OF COLLIE, 

 SHEPHERD, OR SHEEP DOGS IMPORTED INTO THE UNITED STATES, 

 OR THE TERRITORIES THEREOF, FROM ANY COUNTRY OF THE 

 WORLD EXCEPT NORTH AMERICA. 



[Refer to Gid or Turnsickness, under Diseases of Sheep.] 

 U. S. DEPARTMENT OF AGRICULTURE, 



BUREAU OF ANIMAL INDUSTRY, 

 Washington, D. C., November 25, 1910. 



The fact has been determined by the Secretary of Agriculture 

 that collie, shepherd, or sheep dogs are subject to the infection of 

 tapeworm (Tsenia ccenurus), the infective element causing gid, 

 sturdy, or staggers in sheep, through the invasion of the brain and 

 spinal canal of these animals by the cystic form of this parasite 

 (Ccenurus cerebralis) : 



