86 THE APHIS VASTATOR ON OTHER PLANTS. 



feeds, and which enlarge and spread until ultimately the 

 entire leaf becomes infected. 



(346.) Upon the tomato, which has also been affected 

 with a disease, I discovered winged specimens at the gar- 

 dens of the Horticultural Society, but was not successful 

 in finding larvae or pupse, perhaps because they had then 

 all assumed their final state. At the garden, however, of 

 my friend Mr. Terry, at Fulham, I found the insects in 

 all stages in the greatest profusion. 



(347.) The Aphis may also be occasionally found upon 

 the Indian corn. I had it sparingly in the larva state upon 

 some of the plants growing in my garden at Finsbury 

 Circus ; and, at the gardens of the Horticultural Society, 

 I discovered it in the winged ' state upon the same vegeta- 

 ble in great abundance, but could not detect any larvae. 



(348.) In several instances I have found the creature 

 upon wheat plants which were growing in or near a potatoe 

 field ; but I have nevertheless some doubts whether it can 

 entirely live and thrive upon it. 



(349.) I would invite particular attention to this ques- 

 tion, for it will be a very serious matter if the insect can 

 live and propagate freely upon this grain. In examining 

 this subject, the naturalist must not confound another large 

 Aphis, which also lives upon the wheat, with the vastator. 



(350.) I procured two or three plants of wheat which 

 had sprouted again after having been cut down with the 

 sickle, and upon the green stalks of these I placed speci- 

 mens of the vastator, which there lived and throve very 

 well, and propagated their species. Since writing the 

 above paragraphs I have had even further evidence of this 

 insect preying upon the wheat. 



(351.) This year the destroying cloud of vastators has 



