OF WASHINGTON. 65 



These insects continued throughout the month, whenever the 

 weather was warm and calm enough to permit of their flight, 

 and at the close of the month another lot preserved showed the 

 same preponderance of hirticula and arcuata and about the 

 same relative proportion of micans, but instead of fraterna a 

 single specimen of hirsuta was taken. Thus during the month 

 of May these species occurred simultaneously and continuously. 



By carefully picking off and shaking down two or three times 

 between S and n o'clock, I had no great difficulty in substan 

 tially preserving the foliage of the trees named. During the 

 present month there will undoubtedly be a sequence of the 

 species, but in far less abundance and with no essential injury to 

 the foliage. I have a suspicion that the habit which our oaks, in 

 the District at least, manifest, of putting out a secondary vigorous 

 growth in the month of June or later, has been acquired as a con 

 sequence of the very general eating-off of the terminal young 

 growth in the beginning of the season by Lachnosterna. How 

 very difficult these insects are to deal with when the question is 

 one of a large number of trees has been indicated the present 

 spring by the experience of Mr. D. H. Rhodes, who has charge 

 of the tree-planting in the grounds at Arlington. He had a very 

 large number of young maples set out from the nursery and very 

 many of them have been ruined by these beetles, and the meas 

 ures he could adopt failed to prevent their onslaught. 



I had a curious experience with the first lot I preserved. They 

 were thrown into an old cyanide bottle, the cork of which was 

 not very tight, and the cyanide in which was more or less inop 

 erative. The bottle was lined with- blotting-paper and the 

 beetles just exactly two dozen specimens chewed the paper up 

 into a triturated mass, some of them retaining life up to the third 

 week. This was a rather singular experience, considering that 

 in empty bottles the beetles would perish in as many days, and I 

 have little doubt that the blotting-paper saturated with cyanide 

 and thus kept moist helped to preserve life in these insects in this 

 instance, a result which one would hardly have anticipated from 

 its well-known deadly effects upon insects generally. 



NOTES ON COCCID^E. 

 By C. V. RlLEY, Ph. D. 



MODE OF HIBERNATION EFFECTS OF SEVERE COLD VIVIPAR- 



ITY REMEDIES. 



General experience indicates that most of our Coccidas hiber 

 nate in the egg state, yet there is no uniform rule in this respect 

 and I have been somewhat interested the past year in noting the 

 hibernating habits of a few species that have come under my own 



