310 



cost for one treatment is about £2 10s. This work may be done in 

 the autumn or the spring, but the best time is about 15th August to 

 15th October. After the first year the work should be continued for 

 another two or three years, using about a quarter the number of cans. 

 Complete eradication is considered quite possible. 



HeUothis {Chloridea) obsoleta, F., was found to be more severe 

 in many instances where dusting had been carried out than where 

 it had been omitted ; this may possibly be in some way due to the 

 destruction of natural enemies. Dusting should apparently be done 

 early and when the weather is wet. Four or five applications made 

 under the proper conditions should prove profitable. The applications 

 should be made two or three days after the hatching of the bollworms 



begins. 



It has been resolved to urge upon Congress and the legislature 

 of the different southern States the appropriation of ample funds 

 to assure prompt investigation of all suspicious reports of the presence 

 of the pink bollworm [Platyedra gossypiella, Saund.]. It has further 

 been resolved to continue "the eradication work by .the maintenance 

 of non-cotton and regulated zones, which are to be extended wherever 

 necessary, and to urge the adoption of compulsory cotton seed sterilisa- 

 tion. The steriUsation of cotton seed against the larvae is discussed. 

 The thermal death-point was found to be between 130 and 145° F. 

 At a temperature of 130° all larvae were killed in 45 minutes, at 145° 

 in 10 minutes. It was found that seed may be kept at a temperature 

 of 170° for an hour without injuring it, and the germinating quaUty 

 is apparentlv improved. It is proposed to test various types of 

 machines in Mexico, and an attempt will be made to require all cotton 

 gins to be equipped with sterilisers. 



Wakel.and (C). Successful Poisoning of Eleodes Beetles.—//. 



Econ. EnL, Geneva, N. Y., xv, no. 1, February 1922, pp. 112-113. 

 By means of co-operative work over a large area it appears possible 

 to eradicate Eleodes Iiispilabris b}' the use of poison bran mash during 

 two successive seasons. The adults feed greedily for about a month 

 after emergence, and will readily eat the poison bait even when there 

 is an abundance of unpoisoned food. The bait was as effective after 

 ten days as when first distributed. These investigations are to be 

 continued during the present year. 



Smith (M. R.). Some Ants noted to infest Houses in Mississippi 



during the Summer and Fall of 1921.—//. Econ. Ent., Geneva, 



N.Y., XV, no. 1, February 1922, pp. 113-114. 



The following ants are recorded in order of their economic importance 



as house pests in Mississippi ■.—Iridomyrmex humilis, Mayr (Argentine 



ant), Monomormm minimum, Buck., M. pharaonis, L., Solenopsis 



geminata, F., 5. molesta. Say, Cremastvgaster lineolata, Say, Iridomyrmex 



analis, Mavr, Tetramoriimi guineense, F., Solenopsis geminata, ¥., 



subsp. rnfa, Jerd., and Camponotus caryae var. rasilis. Brief notes 



are given on the distribution and habits of these species. 



Department of Horticultural Inspection.—//. Econ. Ent., Geneva, 



N. Y., XV, no. 1, February 1922, p. 120. 



Nests containing from three to six living larvae of the Pierine 



butterfly, Aporia crataegi, L., have been intercepted at New York 



in shipments of fruit and rose stocks from France. Manetti rose stocks 



