BEPORT OF THE ENTOMOLOGIST. 



323 



THE KOCKY MOUNTAIN LOCUST. 



(Cahptenus spretus Uhler.) 

 Order Orthoptera; Family Acrid tdm. 



This omnivorous insect naturally does not neglect Cabbage when the 

 opportunity offers, and we have mentioned it as one of the food-plants 

 of this species in our Seventh Missouri Report. For a full account of 

 this insect we refer the reader to the First and Second Reports of the 

 United States Entomological Commission and to our last three Mis- 

 souri Reports. 



SUCCESSFUL INTRODUCTION OF A PARASITE OF THE IMPORTED 



CABBAGE WORM. 



In our last Annual Report, while speaking of the parasites of the Im- 

 ported Cabbage Worm (Pieris rapce)j we considered the question of the 

 importation of one of the commoner European parasites, viz., Apanteles 

 glomeratus, Linn., recounting our former efforts, and also those of Mr. 

 Otto Lugger, of Baltimore, to introduce and colonize it. From all we 

 can learn from the letter received from Mr. Lugger, his effort proved 

 unsuccessful. We now have the pleasure of recording the successful 

 introduction of the species in the vicinity of Washington. We received 

 during the past winter a number of cocoons from Mr. G-. O. Bignell, of 

 Plymouth, Eng., a portion of which had already given forth the perfect 

 flies, but a large number of which still contained the pupa. The flies 

 began to come out during the early spring, and on the 23d of xYpril 

 last we had liberated 45 specimens of both sexes in a cabbage field at the 

 Soldiers' Home. We also left instructions to have others liberated from 

 time to time, as they issued, after our departure for Europe, and finally, 

 in May, a number of cocoons were placed upon one particular cabbage 

 plant. 



It was with no small degree of pleasure that during the fall, upon re- 

 visiting the same cabbage field in November, two masses of cocoons were 

 found, with the shrunken larvae which the insects had preyed on, many 

 rods away from those deposited in May. From some of the cocoons 

 found in autumn the flies were obtained, and proved to be, as the co- 

 coons indicated they would, the very same Apanteles glomeratvs. Thus 

 we have absolute jjroof of the successful introduction and propagation 

 of the species, and we may expect to hear of its discovery from year to 

 year at points more and more remote from the place of introduction. 



GENERAL TRUTHS IN APPLIED ENTOMOLOGY* 



Mr. President and Gentlemen of the Georgia State Agricultural Society: 



On your programme I am booked for an essay on "Insects Destructive 

 to Southern Agriculture." Your worthy secretary, Mr. Grier, is respon- 

 sible for that title, for I had no idea what it was to be till the circular 

 was received, on the very day of my departure from Washington. In 



* An address delivered February 12, 1884, by C. V. Riley, before the Georgia State 

 Agriculture Society at its annual meeting in Savannah. 



