43 



were made in the laboratory in cages constructed for the purpose, but 

 no favorable results were secured. 



While realizing that an experimenter should not have convictions 

 before he has performed his experiments, the writer must confess that 

 very little was expected from the use of the fungus. The test was 

 undertaken since it off ered the only hope of relief, for we felt that, 

 since we have authentic statements to the effect that a greater or less 

 measure of success has been secured in other parts of the world, we 

 can be successful in the United States if we can secure the same 

 organism and duplicate the conditions that obtained in those suc- 

 cessful tests. 



Remarks concerning the damage caused by grasshoppers were made 

 by Mr. Fletctur and Mr. Gillette. Mr. Cooley stated th t the area 

 devastated in Montana was so large that the problem of control would 

 approach that of covering an acreage equal to the entire State of 

 Massachusetts. The fungus disease received from South Africa had 

 proved of little value, and Mr. Gillette stated that his experience with 

 it had been the same in Colorado. 



MORNING SESSION, WEDNESDAY, DECEMBER 30, 1903—9 A. M. 



The meeting was called to order bj T Doctor Fletcher, and the follow- 

 ing paper was presented : 



OBSERVATIONS ON THE LIFE HISTORY OF LIBURNIA CAMPES- 

 TRIS, WITH NOTES ON A HYMENOPTEROTJS PARASITE INFEST- 

 ING IT. 



By Otto H. Swezey, Columbus, Ohio. 



In the family Fuigoridse there are very few species whose life his- 

 tory has been completely worked out. For the most of the species 

 very little is known of their egg-laying and the younger stages. Dur- 

 ing the past season I have been able to make some interesting obser- 

 vations, including a fairly complete tracing of the life history of a 

 few species. 



Liburnia campestris is our most common species in grass lands 

 throughout the eastern and central part of the United States. It is 

 one of the species showing dimorphism, some individuals having 

 elytra somewhat shorter than the abdomen (brachypterous), while 

 others have the elytra extending for about one-third of their length 

 beyond the abdomen (macropterous). 



In the autumn of 1902, at Columbus, Ohio, nymphs of some species 

 were taken in quite large numbers, whose identity at the time was 

 impossible to determine further than that they belonged to the sub- 

 family Delphacinse, as evidenced by the movable spur at the apex of 



