REPORTS OF OBSERVATIONS AND EXPERIMENTS IN 

 PRACTICAL WORK OF THE DIVISION. 



INTRODUCTION. 



For some years past it has been the custom, with the approval of the 



Secretary of Agriculture, to bring together in a single bulletin, at the 

 close of each season, the formal reports of the field agents of the Divi- 

 sion; thus, Bulletins 22, 23,26, and 30 of the Division comprise the 

 reports of the field agents forthe years 1889. 1890. 1891. and 1892. This 

 present bulletin is a continuation of this series. AH of the field agents 

 represented in Bulletin .' .-(.), with the exception of Mr. Larrabee, were 

 continued through the year 1893. All, however, were discontinued 

 February 15, 1894, and are no longer connected with the Division, with 

 the exception of Mr. Coquillett. who has been called to Washington and 

 is now an office assistant. 



Mr. Burner has reported in the main on the observations made upon 

 injurious locusts, and judging from these observations there is no reason 

 to fear serious injury during the year 1894. The occurrence in special 

 abundance of several injurious insects, including the army worm and 

 the wheat-head army worm is reported, and a number of new insect 

 injuries are mentioned. 



Mr. Coqnillett's report consists principally of a somewhat detailed 

 account of several different kinds of leaf-eating caterpillars which attack 

 fruit trees and nut trees in California. To this he adds a section on 

 arseniureted and sulphureted hydrogen as insecticides. 



Mr. Koebele presents a few additional observations upon the sub- 

 ject of the hop plant-louse in the northwest, and some additional facts 

 regarding the latest importation of beneficial insects from Australia. 



Miss Murtfeldt gives a general summary of the injurious insects of 

 Missouri for the year 1893. 



Prof. Osborn, in a like way. reports upon the injurious insects oi 

 Iowa for the season, ami includes some important observations on the 

 hatching of the eggs of the horse bot-fly. 



Dr. Packard reports the almost complete recovery of the regions in 

 Maine ravaged in 1878-'87 by the spruce worm, and he includes a 

 number of new observations upon insects injurious to forest trees. 



0. v. EL 



