114 



ELEVENTH REPORT. 



THE SCREW-WORM FLY WITH THE REPORT OF A CASE OF 



MYIASIS NARIUM. 



Alexander W. Blain. 



(Abstract.) 



Myiasis or the invasion of the human subject by members of the Diptera 

 (flies) has received but scant notice in our larger medical text-books and in 

 medical literature in general. As a matter of fact the disease is compara- 

 tively common in man, especially the inroads of the Screw-worm Fly 

 {Compsomyia macellaria-Fab). 



Compsomyia macellaria. 

 Fig. 1 — adult. Fig 2.— larvae. Fig. 3. — egg, (after Francis). 



In the south and south-west the attacks upon horses, sheep and cattle 

 have been noted b}" A-arious writers. (In Kansas by Snow, in Louisiana 

 by Morgan, in Mississippi by Weed and in Texas by Francis.) This past 

 summer a veterinary surgeon of San Bernardino, told me the condition was 

 not rare in southern California. 



The recognition of the injurious nature of the insect appears to have Ijeen 

 in the early days of American settlement, and its description has occupied 

 the attention of numerous naturalists. The distribution of the species is 



