118 The Roclzy Mountain Locust. 



The Anthomyia Egg-Parasite, (Anthomyia radicum, 

 var. calopteni.) — This is by far the most wide-spread and 

 generally useful of the different egg enemies. It has 

 occurred in Minnesota, Iowa, Nebraska, Kansas, Missouri 

 and Texas, and wherever I have examined the locust eggs, 



whether in Missouri, Kansas or Nebraska, I have found it 

 destroying on an average about ten per cent, of them. 



The following items will serve as samples of many others 

 that might be given, referring to the work of this same 

 parasite : 



Recently a white worm or maggot has been discovered in the 

 locust eggs laid in this vicinity, and so general are the grubs that 

 we really look for a great diminution in next year's locust crop. 

 About the time the hoppers began laying eggs we had a hard, soak- 

 ing rain, and since then we have had several more — the last this 

 morning. By this time the ground is well soaked with water and 

 the eggs were and are laid in earth that is quite moist. It is about 

 two weeks since the hoppers first reached Mankato, they have laid 

 many eggs, and already this worm or maggot has developed and 

 seems to be on the increase, being found in the egg cells, where it 

 sucks or destroys the egg. Some cells that I have opened have 

 had two and three worms in them. — [From a letter from J. C.Wise, 

 Mankato, Minn., August 20, 1876. 



On the ninth I sent you a b^x of locust egg parasites, and to-day 

 I will send you some more of different sorts or different stages of de- 



21.] 



Anthomyia Egg -Parasite:— a. fly , b, pupa c. larva from side, d, i.ead of same 

 from above— enlarged, 



