LOUISIANA CIKCTLAK No. ti. 



19 



that go with these, and the isolated depressions filled with 

 that one often sees in traveling through the domain. \vc have 

 $* favorable breeding grounds for these insert n be 



found anywhere. 



Some of the area included in the above consideration could 

 b( drained, and probably will be some time in the future, but 

 much of it can not be, and, on the whole, it is doubtful if any 

 very large areas will receive relief by drainage, but this remains 

 for future developments to prove. 



I have in mind a certain section, not in the State of Louisi- 

 ana, where mosquitoes and horseflies were exceedingly numerous 

 ix* past years when the country was being ditched and cleared. 

 At the present time this same section is thoroughly under- 

 drained, no water stands long enough to become stagnant, and 

 these insects are so uncommon that they hardly ever receive con- 

 sideration. Drainage is a good remedy for horseflies, but there 

 is no use to make such a recommendation for a country where 

 i<, is impossible to put it into operation. 



A section of Louisiana that is especially troubled by horsr- 

 flies is the section located in proximity to the gulf coast. This 

 whole country is only a few feet above sea level, and the acre- 

 age of wet and marshy land is very large. Running nearly paral- 

 lel to the shore of the gulf is a series of alternating ridges ;md 

 depressions. The depressions form extensive fresh water marshes, 

 over a part of which the water stands the year round. The rivers 

 that traverse this country are sluggish and at intervals spread 

 out into lakes or extensive marshes. Thus various aquatic ani- 

 mals find conditions to their liking and are present in abundance. 



Fl(; 11 GrePii iM-Md horsHly (Tirtintni* i 



. female; i>. m;ii<>. Mii:in: <! to two diameter*. 



