93 
so late as the eggs in our breeding cages, which seem to belong to 
a second generation. Adult beetles believed to be of this second 
generation were found abundantly by us August 21, in the grass in 
the apple orchard of H. M. Dunlap, at Savoy, not far from Ur- 
bana, but not near any strawberry bed. Some of these beetles 
were put in a cage with the grass (Agrotis major) in which they 
were found. They lived until late in September, finally dying, 
probably as the result of artificial conditions, but no signs of feed- 
ing or oviposition could be discovered. Cooley remarks that the 
beetles come together, as if for hibernation, as early as August, and 
that the periods of the different stages overlap, so that it is very 
difticult to determine the number of generations, all stages being 
found together at the same time, the indications being, however, 
that there is but one generation a year in his state. In Illinois, as 
shown by our observations, there are apparently two generations of 
larvse, one in May and one in July, the first becoming adult in June 
and the second in August, the latter hibernating until the follow- 
ing April. 
OTHER BIOLOGICAL DATA 
A peculiar feature of the occurrence of this species in unusual 
numbers is its limitation to very small areas, and the lack of any 
decided tendency to scatter widely and infest large areas when 
its numbers become excessive. This is probably due to the fact 
that the adults are wingless, their wing-covers being solidly grown 
together, so that they can not fly; hence their only means of dis- 
persal is by crawling, except when they are introduced into a new 
district on strawberry plants from an infested field. Mr. Cooley 
has suggested that they may be limited by certain soil conditions ; 
but this seems unlikely. That they do migrate to some extent in 
search of suitable winter cjuarters is shown by their entering houses. 
In the Alpha strawberry fields, the principal infested plot had 
shown injury over two small areas the preceding spring, which was 
the third spring after planting. The more severe injury was still 
limited to these areas, but there was now evidence of injury in 
other parts of this plot, and also in the edge of another, adjacent. 
Two plots, separated from these only by a lane, showed no sign of 
the insect or its injury. 
The infested leaves were reddened and small, and the crowns 
were so weakened by injury and decay that the plants and a layer 
of straw on the ground could readily be rolled up together like a 
carpet. Larv?e and pupa^ were very numerous, mostly about two 
inches below the surface ; the adults were less numerous and were 
well hidden in the straw and among the lower leaves. In Maine, 
an area of three square feet in an infested patch was carefully ex- 
amined, and more than 200 individuals, nearly grown larvae, pupae. 
