6 

 of the wheat bulb-worm, and a discussion of certain insects injurious 

 to nurserj trees. 



Number sixteen of the series was published in 1890 in Volume 

 XXVI. of the Agricultural Transactions. Its mot important articles 

 arc one on the chinch-bug, largely devoted to a statistical study of its 

 relations to the raising of wheat: one on the corn hill-hugs; and one 

 on the cutworms. 



The main articles oi the Seventeenth Report (Agricultural Trans- 

 actions, Vol. XX\ 111.. 1891) are on the fruit-tree bark-beetle, on ex- 

 periments with arsenical poisons for the plum-curculio, on the common 

 white-grubs, on the life histories of the Hessian fly and of the corn 

 root-aphis, and on the fungous diseases oi the chinch-hug. It contains, 

 as an appendix, an analytical list oi the entomological writings oi Dr. 

 William LeBaron, the second State Entomologist of Illinois. 



The Eighteenth Report | Agricultural Transactions. Vol. XXXI.. 

 L894) is almost entirely devoted to a monograph ot" insect injuries to 

 Indian corn affecting the seed in the earth and the underground part 

 ^i the plant. 



The Nineteenth Reporl I Agricultural Transactions, Vol. XXXI 1.. 

 1895) is mainly devoted to an elaborate discussion of the contagious 

 diseases oi the chinch-hug. with an analytical list oi American article- 

 on this subject. It contains likewise an article on the white ant in 

 Illinois, and another on the Mediterranean flour-moth, the latter (by 

 \\ G Johnson, an assistant in the office) printed as an appendix to 

 the regular report. 



In number twenty (Agricultural Transactions. Vol. XXXIV., 

 18 s i- an article on the San lose scale in Illinois, one descriptive of 

 an extraordinary outbreak oi white-grubs in Christian county, and 

 others on various aspects oi the chinch-hug problem. An article on 

 the white pine Chermes, bj E. 1 . Storment, is printed as an appendix 

 to this report. 



The Twenty-first Report contains two articles— one on the San 

 .ale: and the other a monographic article on the economic en- 

 tomology oi the sugar-beet. These were also separately issued as 

 bulletins 56 and 60 of the Agricultural Experiment Station. 



In the Twenty-second Report, issued in 1903, the principal article- 

 are on the corn hill-hugs in Illinois, on field insecticide work against 

 [bs< scale, and on the principal nursery pests likely to he dis- 

 tributed in trade. The first two articles were printed in 1902 as bul- 

 letins 79 and SO of the Experiment Station, and that on nursery pe<ts 

 ssued bv the same station in 1°01 as Circular 36. Additional 



