REPORTS OF OBSERVATIONS AND EXPERIMENTS IN THE PRACTICAL 

 WORK OF THE DIVISION. 



INTBODUCTION. 



Mr. Albert Koebele, the agent of the Division at Alameda, Cal., was 

 sent to New Zealand and Australia early in August, and much of his 

 time for a mouth or so previous to his departure was taken up with 

 preparations for the journey. The course of experiments assigned to 

 him was therefore interrupted, and there is no formal report from him 

 the present season. The reports of the other agents are included in 

 this Bulletin, including a report of the season's observations upon the 

 Boll Worm by Mr. Mally. These reports are little more than summaries 

 of the work performed by each of these agents. Special investigations 

 have, from time to time, been assigned to them and upon matters of 

 immediate importance reports have been received at different times 

 through the year and summarized in short articles in Insect Life. 



Mr. Burner's report includes only a brief account of the injurious in- 

 sects which have been most prominent during the year in Nebraska. 

 The greater portion of his time was devoted to the investigation of 

 destructive locusts, a full account of which will be published in Bulle- 

 tin No. 27. 



Mr. Coquillett gives a full account of his work upon California scale- 

 insects, and includes many new facts and the results of a number of 

 important experiments. His report upon the work of the destructive 

 locusts of California during 1891 will also be published in Bulletin 

 No. 27. 



Miss Mary E. Murtfeldt gives in her report her usual summary of the 

 injurious insects of the season in Missouri and of experiments with in- 

 secticides. 



Prof. Osborn, in addition to a report upon the destructive locusts of 

 Kansas, has submitted a report upon the insects of the season in Iowa, 

 and includes with this an account of some successful trials with a sin- 



