246 REPORT OF THE COMMISSIONER OF AGRICULTURE. 



time, so that the insects were less active than usual. After the appli- 

 cation a few Cicadas were noticed ovipositing, but none of them ou the 

 bushes that had been treated. This experiment, therefore, is of nega- 

 tive value. 



It is obvious from the foregoing that in pyrethrum and the kerosene 

 emulsion, we have two valuable insecticides that may be used to advan- 

 tage at the time the insects are issuing from the ground, but that neither 

 these substances, nor the others that have been so far tried, can be de- 

 pended on, so far as experience has gone, when applied to trees, to pro- 

 tect these from the perfect insects when once mature and ovipositing. 

 This is about the conclusion arrived at in 1868, and shows the impor- 

 tance of anticipating the injury and of dealing with the Cicadas while 

 they are issuing from the ground. 



CONSIDERATION OP THE TWO BROODS THAT APPEARED IN 1885. 



With a view of acquiring as much exact information as possible in 

 reference to these two broods, the following circular was sent out on 

 the 1st of June : 



Circular No. 16.] United Statks DKPAETivrENT of Agriculturb, 



Division of Entomology, 

 Washington, D. C, June 1, 1885. 

 Sir : During tlie present year two large broods of the Periodical Cicada, or so-called 

 "Seventeen-year Locust" (Cicada septendecim L.), one of the seventeen-year (sejytende- 

 cim) race, and one of the thirteen-year (tredecim) race, will make their appearance in 

 different parts of the country. 



I would beg you to glance over the following list of localities and to send me dur- 

 mg the season any confirmatory experience as to the appearance this year of the 

 insects in those localities, or in any localities not indicated. Any evidence giving 

 the extent of territory over which they appear in your county or State, or any well- 

 attested dates of their appearance in previous years, will be thantfully received and 



appreciated : 



Brood YJI.—Tredeoim (1859,. 1872, 1885). 



Illinois, — Jackson, Union, Macoupin Counties. 



Missouri. — Saint Louis, Boone Counties. 



Georgia. — De Kalb, Gwinnett, Newton Counties. 



Tennessee. — Madison County and northern portion of the State, 



Mississippi, — Copiah County, Oxford, and eastern portion of the State. 



Louisiana. — Carroll Parish. 



Kansas, — Phillips County. 



Arkansas, — Flat Bayou. 



The existence of this brood has been verified in past years in the parts of Illinois, 

 Missouri, Tennessee, Mississippi, and Arkansas indicated; but the localities in Kan- 

 sas, Georgia, and perhaps Louisiana, require further confirmation this year. 



Brood XKJI.—Septendecim (1868, 1885). 



Xeio York. — Kings, Monroe Counties. 

 Massachusetts, — Fall River, southeast portion of the State. 

 Tei-mont. — Oakland. , 



Pennsylvania, — Lancaster. 



07i!0.— Greene, Franklin, Columbiana, Pike, Miami Counties, and vicinity of Tol.vld. 

 //irftanrt.— Tippecanoe, Delaware, Vigo, Switzerland, Hendricks, Marion, Deaibo-n 

 Wayne, Floyd, Jefferson, Richmond Counties. 

 Michigan. — Southeastern portion. 

 Delaware. — Very generally. 

 Marijland. — Very generally. 

 District of Columiia, — Very generally. 

 Virginia, — Very generally. 

 Kentucky, — Around Louisville. 

 Georgia. — Habersham County. 



Beaiieotfally yonn, 



C. V. RILEY, 



Entomologist. 



