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and Norgaard^ state that Calliphora dux Esch. during some seasons 

 causes heavy losses among sheep hy attacking scars caused by sheep 

 scab and by blowing soiled wool, from which the larvse ultimately^ 

 work into the flesh. In Australia the losses to sheep raisers due to 

 related species of flies have been enormous. Professor Froggatt has 

 studied the various forms concerned and has published a number of 

 papers dealing with the pests. The most important of these w^as 

 pubHshed in 1913. ^ As a result of his investigations Professor Froggatt 

 found that three species of blow flies indigenous to Australia are re- 

 sponsible for the infestation of sheep. These are Calliphora oceanioe, 

 C. villosa, C. rnfifacies. Although the common green-bottle flies, 

 Lucilia sericata and L. coesar, occur commonly in Australia, these 

 species have not been bred from soiled wool in that country. In 

 Great Britian, and parts of continental Europe, these species, espe- 

 cially L. sericata, are commonly known as the sheep maggot flies, being 

 responsible for the blowing of w^ool there. In southern Russia it 

 appears that the fly, Wohlfahrtia magnifica, is the principal culprit in 

 connection with this type of injury to sheep. Portchinsky^ states that 

 this species, which is viviparous, is very annoying and dangerous 

 to sheep. Twenty-five per cent or more of the sheep are infested an- 

 nually by its larvae. Sarcophaga ruficornis is one of the flies which 

 produces severe forms of myiasis in India. 



Importance of Muscids and Sarcophagids which cause Myiasis 

 IN Man and Animals in the United States 



Relationship to Slaughterhouse and Other Food Products. — 

 As has been stated, a number of species of flies are concerned in the 

 production of myiasis in man and animals. Of these, Chrysomyia macel- 

 laria is by far the most important. Aside from the causation of myiasis, 

 the flies of this group are of considerable importance. They all have 

 the habit of visiting carcasses and other decaying animal and vegeta- 

 ble matter, and are likewise rather strongly attracted to blood and 

 fresh meat, as well as cooked meat and other good products. In parts 

 of the south, in particular, these flies are a veritable pest about slaugh- 



1 1908. Van Dine, D. L. and Norgaard, V. A. Abstract of a preliminary report 

 on insects affecting live stock in Hawaii. Proc. Hawaiian Live Stock Breeders' 

 Association, Fifth Annual Meeting, 1907, pp. 19-70. 



2 1913. Froggatt, W. W. and Cooper, W. F. The sheep maggot fly pest in 

 Australia, pp. 88, figs. 15. The Cooper laboratory for economic research, Watford, 

 England. 



3 1913. Portchinsky, A. [Memoirs of the Bureau of Entomology of the Scien- 

 tific Committee of the Central Board of Land Administration and Agriculture.] 

 Vol. 9, No. 5, pp. 30, figs. 23. St. Petersburg. 



