REPORT OF MISS EMMA A. SMITH. 
To Cyrus Thomas , Slate Entomologist of Illinois: 
I hereby submit to you my report of the noxious insects of Northern 
Illinois, which have come under my observation during the summer 
of 1877. 
Directly after my appointment by yourself as your assistant, I sent 
out cards to all the principal places in Illinois north of Springfield, 
urging correspondence on the subject of injurious insects, the result 
of which I will give in the notes following. Many of the letters I 
followed in person, making investigations I could not have otherwise 
obtained. Many kinds which have proved injurious to vegetation in 
Northern Illinois have been treated of at length in other reports, and 
I will simply mention them, together with the locality most infested. 
Of the original work I have been enabled to do I will treat of at 
length. There are a few insects whose life history I have com¬ 
menced to unravel, but the time given has been too short to complete 
the know r l°dge sufficiently to treat of here. 
The Colorado Potato Beetle, Doryphom, 10-lineata , Say, during early 
summer, had every indication of becoming common throughout 
Northern Illinois. The people in the infested vicinity, when show¬ 
ing the greatest apprehension from their ravages, were relieved by 
heavy rains, which killed many of them, and but little damage en¬ 
sued. 
The Canker-worm, Anisopteryx vernata , Peck, made its appearance 
during the past two years in both Tazewell and Peoria counties, 
although not so numerous as in the year 1876, yet enough so to cause 
much damage. 
The Tent Caterpillars have been very numerous both in orchards 
and forest trees, the Fall Web-worm, Hyphantria textor, Harris, being, 
perhaps the most numerous. 
Comparatively little has been written me of the Chinch-bug, Mi¬ 
cropus leucopterus , Say, and for the reason, undoubtedly, that the sum¬ 
mer has been an unusually wet one. 
The oak forests have been seriously injured by the caterpillar of a 
small moth, which has appeared in great numbers, and although it 
has been observed in years previous, yet not to any great extent. I 
have succeeded in working up the natural history of the insect, and 
