226 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 7 



Atchison, Leavenworth and Cherokee. In fact, parasites were found 

 wherever material was collected, and the area given includes practi- 

 cally all of the chinch bug infested region in the State. 



Percentage of Parasitism in Different Localities 



The average percentage of parasitism of chinch bug eggs collected 

 from various parts of the State outside of Manhattan was 16 per cent. 

 Table IV shows the record of the collection of eggs and the per cent of 

 parasitism. 



TABLE IV.— SHOWING PERCENTAGE OF PARASITISM IN VARIOUS PARTS OF THE STATE* 



Place Collected 



Crawford 



Pottawatomie Co 



Dodge City 



Effingham 



Winfield 



Columbus 



lola 



Independence 



Hays 



Newton 



McPherson 



Conway Springs 



Kingman 



Greensburg 



At Manhattan the average percentage of parasitism for the summer 

 was 32.1 per cent. The greatest number of parasitized eggs were 

 found in the corn field both on the corn plants, and in the crab grass. 



TABLE v.— SHOWING PERCENTAGE OF PARASITISM OF CHINCH BUG EGGS AT MANHATTAN, 1913 



Month 



April 



May 



June 



July 



August 



September 



Per cent, of Eggs Parasitized 



33.8 



19. 



22.9 



40.5 



38. 



38.7 



Chinch bug eggs are often laid in bunches of two or more, and it is 

 interesting to note that the percentage of parasitism is very high in 

 such cases, ranging from 75 to 100 per cent. 



Efficiency — The average percentage of parasitism over the state 

 of 16 per cent does not represent the actual number of chinch bug 



iThis percentage of parasitism over the state is much lower than that at Man- 

 hattan, because it is based on only one collection of material and this material was 

 often collected at a time when chinch bug eggs were scarce in the fields. 



