October, '22] mccolloch: attraction of corn for chloridea 333 



presence gave passengers we recommended, first : A complete fumiga- 

 tion of the affected ships with sodium cyanide gas. Second: The 

 equipment of the Chief Steward's office with a fuh supply of perforated 

 tins, with sponges, and a quantity of the formula A and B syrup. Third : 

 That formula C powder be furnished the same office in quantity. These 

 last two recommendations were made so that the steward and his 

 helpers might be in a position to combat ants did they appear in spite 

 of the fumigation. These recommendations have been acted upon and 

 the economic control of this pest on shipboard has been accompHshed. 

 Formula A, Government Formula for Argentine Ant Poison: 



Granulated sugar 9 lbs. 



Water 9 pts. 



Tartaric acid (crystalized) 6 grams 



Benzoate of soda 8.4 grams 



Boil slowly for 30 minutes. Allow to cool. 



Dissolve sodium arsenite ( C.P.) 15 grams 



In hot water y^ pt. 



Cool. Add Doison solution to syrup and stir well. Add to 

 the poisoned syrup: 



Honey IX lbs. 



Mix thoroughly. 

 Formula B, Formula for Native Ant Poison: 



White Arsenic 2 oz. 



Caustic soda 2 oz. 



Sugar 1 lb. 



Water 1 pt. 



Formula C 



6 parts by bulk — Sodium flouride 



2 <i <i i< — Pyrethrum (Buhach) powdered stems and flowers 



2 " " " — Corn starch 



Teaspoon, tablespoon, cup, indeed any convenient measure may be 

 used in making up this powder. Care should be taken to maintain the 

 above given porportions. This powder can be easily used in beds and 

 where ants are by dusting from can with perforated top. 



THE ATTRACTION OF CHLORIDEA OBSOLETA FABR. 

 TO THE CORN PLANT^ 



By James W. McColloch, Associate Entomologist, 

 Kansas State Agricultural College and Experiment Station 



A complete study of the life economy of any insect must eventually 

 include a consideration of the fundamental activities necessary for the 



^Contribution No. 65 from the Entomological Laboratory, Kansas State Agricul- 

 tural College. This paper embodies some of the results obtained in the prosecution 

 of projecc No. 9 of the Agricultural Experiment Station. The writer desires to ex- 

 press his appreciation for the assistance rendered by Mr. H Yuasa in the experimental 

 work of 1919, and in securing certain literature not available in the Station Library. 



