LOUISIANA- -CIRCULAR No. r>. 



merit of tin- horseflies ('and oilier flies of the same family) is 

 somewhat complicated, and the determination of the various 

 stages requires long and tedious study and observation. 



Despite tlie great economic importance of this group, hut lit- 

 tle is known regarding the various species and regarding means 

 by which they may he controlled. 



Perhaps the most valuable acquisitions to our knowledge 

 of these insects during recent years have been those resulting 

 from the investigations by Prof, .lames S. Mine, of the Ohio 

 State rniversity. Mr. Iline has made a special study of them 

 in different States for several years past, and has not only de- 

 scribed many forms hitherto unknown, but has successfully 

 worked out the life histories of a considerable number of species. 



As a preliminary step towards finding suitable measures 



for reducing the numbers of these insects, the State Crop Pest 



Commission, in co-operation with the (lulf Biologic Station, se- 



<jured the services of Mr. Iline during the summer of 1905 in 



making a, study of the horseflies of Louisiana. 



The results of Mr. Bine's work are given in this paper, 

 which is being published concurrently as Bulletin No. 5 of the 

 Oulf Biologic Station of Louisiana, under the direction of 



Director B. II . (iuilbeau. 



WILMON NEWELL, 



Secretary. State Crop Pest Commission of Louisiana. 

 Baton Rouge, La., Feb. 15, 1906. 



