157 



Mr. Russell considered Chalcid parasites imjwrtant factors in the 

 control of this pest. When a fly attack occurs, the parasites also 

 become numerous and reduce the outbreak to normaL It is not thought 

 that the parasites will control the pest so as to prevent it harming sheep, 

 but an imported Chalcid might prove more effective. ¥\y attacks 

 vary in severity according to the time of the outbreak and the species 

 of tiy then prevalent. 



The Government Analyst stated that it had been proved that arsenic 

 mainly adheres to the butt and middle of the wool. In new wool its 

 pressure was greatest in the middle. He had fcumd tluH'c months 

 was the period of protection afforded by the jetting process. 



Davel (D.). Sarna ovina. [Sheep Mange.] — Bol. MinisL Agric. 

 Nac, Buenos Aires, xxvi, no. 1, Januar\' -March 1921, i>p. 93-95. 

 [Received 21st July 1921.] 



The object of this article is to indicate practical measures against 

 sheep mange. For curing the affection dips of lime-sulphur or lime- 

 caustic soda are recommended. Prophylaxis includes isolation from 

 infected places and disinfection of all sheds, etc., and of any sheep 

 introduced from other establishments. 



Cassamagnaghi (A.). Contribuigao para o Estudo da Piroplasmose, 

 e a ImportaQao no Brasil de Reproductores finos. [A Contribution 

 to the Study of Piroplasmosis and to the Importation into Brazil 

 of Pedigree Breeding Stock]. — Ann. Soc. Rnr. Brasileira, S. Paulo, 

 no. 10, April 1921, pp. 600-606. [Received 21st July 1921.] 



The conclusions reached by the author are, that the resistance 

 acquired by bovines to piroplasmosis is not a vaccine immunity but an 

 infection leading up to a tolerance on the part of the animal, and that 

 if this peculiar condition is to be maintained, it is necessary that the 

 infection be maintained, either by ticks or by virulent fluids. The 

 success of immunisation depends on a number of factors, including 

 the size of the dose, the age of the subject and its breed. 



In very dry years ticks disappear owing to the lack of protective 

 vegetation, but when later on rainy years set in, cattle begin to die. 

 The fact that ticks are not uniformly distributed in the pastures 

 accounts for the fatal cases that occur when animals are moved from 

 one part of a ranch to another. 



Hall (M. C). Cuterehra Larvae from Cats, with a List of those 

 recorded from other Hosts. — Jl. Amer. Vet. Med. Assoc, WasJiing- 

 ion, D.C., lix (N. S. xh), no. 4, July 1921, pp. 480-184. 



Dipterous larvae belonging to the genus Cuterehra, Clark, which 

 includes such later genera as Rogenhofera, Brauer, Bogeria, Austen, 

 and Atrypoderma, Townsend, were found on cats in Washington. The 

 author presumes that, though cats are fairly often infested with 

 Cuterehra, they are not the usual host. 



A list is given of the larval forms of various species of Cuterehra 

 occurring in a wide range of hosts. The first stage larva of C. amen- 

 cana has recently been noticed [R. A.E., B, viii, 108]. 



