8 GO llLinois State Lahoratoi'y of Natural History. 



laboratory, the cold weather haviripj caused them to fall 

 to the gi'ound. Their food supply was then very scant, 

 as the leaves were drying rapidly; nevertheless, the bugs 

 were used for experimental purposes, as it was desirable 

 to test the squash-bug disease on as many Heniiptera as 

 possible. Small box breeding-cages were used, but it 

 soon became impossible to find suitable food. Post- 

 mortem appearances and microscopic examination guided 

 my opinions as to the presence of the disease, and the 

 series was early abandoned on account of the condition 

 of the bugs. The appended table is not, however, with- 

 out interest. 



Table V. 



INFECTION EXPERIMENTS WITH GUASSHOPPERS. 



During the progress of this work with the squash-bug 

 bacillus, grasshoppers dead with a supposed contagious 

 disease were received from Prof. C. P. Gillette, Entomol- 

 ogist of the Colorado Agricultural Experiment Station. 

 For atime the two diseases were not clearly distinguished, 

 and some parallel experiments w'ere conducted. It is 

 only necessary here to mention some attempts to inocu- 

 late grasshoppers with the squash-bug bacillus. In one 



