BUREAU OF ENTOMOLOGY. 517 



secured, and as this seemed to be of considerable importance to the 

 farmers, this information has been publislied in the form of a cir- 

 cular, while the investigations are being continued. 



The investigation of the new gallfly attacking seed pods of alfalfa 

 in Arizona and New Mexico is also being continued, as well as inves- 

 tigations of the southern corn leaf weevil. 



The investigation of the relation of leafhoppers to the cultiva- 

 tion of grains and grasses has been included in a manuscript now 

 ready for publication. 



A number of destructive insects not heretofore known to the farmers 

 of the United States has been found about Brownsville, Tex., and 

 'their habits are being investigated with a view of finding out to what 

 extent they may become injurious in the South. 



A new rootworm has proved destructive to corn, sorghum, and mil- 

 let. It is being investigated in both Texas and Arizona. 



Two species of thrips not only injure the foliage of alfalfa in the 

 Western States, but there is good evidence that they are involved in 

 the blighting of the blossom. These two species are being investi- 

 gated in southern California and Arizona, the accumulated data be- 

 ing nearly ready for publication in the case of one species. A third 

 species is being investigated in Oregon and Washington. 



A species of Eleodes has been destructively abundant in Wash- 

 ington, the larvae working a great deal of injury in wheat fields. 

 This problem is likely to be completed during the present calendar 

 vear. 



The investigations of the maize billbug have been completed and 

 the results published in Bulletin 95, Part II. A similar investigation 

 of an allied species, Sphenophorus callosus^ is under way and definite 

 results will be published, together with practical measures for 

 methods of preventing a repetition of the serious damages to corn 

 that have occurred in the past. 



Next to wireworms and white grubs, the most destructive insects 

 in cornfields, particularly where corn follows grass crops, are the 

 corn webworms. and investigations of these insects have been taken 

 up in Ohio, New York. Pennsylvania, Delaware, and North Caro- 

 lina. Probably a number of years will be required for the com- 

 pletion of these investigations. 



Investigations of cutworms and experiments for their control in 

 cornfields have also been undertaken in several States. 



WORK ON INSECTS AFFECTING VEGETABLE CROPS. 



The work on insects affecting vegetable crops, carried on as here- 

 tofore under the direction of Dr. F. H. Chittenden, has during the 

 year comprised investigations at several field stations in different 

 parts of the country, where habits and life histories of truck-crop 

 insects have been studied and where experiments have been made 

 with different remedies with very considerable success. New in- 

 secticidal compounds have been tested and satisfactory field demon- 

 strations have been made against some of the most important truck- 

 crop pests. 



