46 



experiments to ascertain the relative value of various flavours, syrups, 

 etc., in attracting grasshoppers. Sixteen flavours were used in twenty- 

 six different combinations, the results of which are tabulated. Black 

 strap molasses proved by far the most attractive, apple and black 

 strap molasses next, and then wet bran. Two quarts of molasses 

 added to every 25 lb. of bran increased its attractiveness by 28 per cent. 

 In every case the combinations without salt attracted a greater number 

 of individuals, the total being 23 per cent. more. The addition of 

 syrups, with the exception of black strap molasses, did not increase 

 the attractiveness of the wet bran. Experiments show that in every 

 case sawdust and wheat bran mixed in equal parts attracted more 

 grasshoppers than sawdust alone, the increase being about 36 • 9 per cent. 

 Bran alone was only 14 per cent, more attractive than the average of 

 the four mixtures containing bran and sawdust in equal proportions. 



Ford (A. L.) & Larrimer (W. H.). U.S. Bur. Ent. Some Factors 



influencing the Efficiency of Grasshopper Baits.—//. Econ. Ent., 



Geneva, N.Y., xiv, no. 3, June 1921, pp. 292-299. [Received 



22nd November 1921.] 



In these experiments to test the relative value of Paris green, white 



arsenic and crude arsenic, molasses gave much better results than any 



of the other syrups tried, there being practically no difference between 



strengths of one or two quarts to 25 ib. of bran. There is very httle 



difference in the three arsenicals when used under similar conditions 



at their optimum strengths and rates. Apparently higher strengths of 



Paris green are less effective than the lower ones. As a result of 



these experiments the strengths advocated are \ lb. Paris green, f lb. 



white arsenic or U lb. crude arsenic to each 25 lb. of bran. The 



baits should be applied at the rate of from 5 to 10 lb. per acre. 



Smith (R. C). Observations on the Fall Army Worm [Laphygma 

 frugiperda, Smith & Abbott), and some Control Experiments. — 



Jl. Econ. Ent., Geneva, N. Y., xiv, no. 3, June 1921, pp. 300-305. 



[Received 22nd November 1921.] 

 In September 1920 Laphygma frugiperda suddenly appeared in 

 large numbers in various localities in the central and east central 

 parts of Kansas. The outbreak, the features of which are described 

 in detail, was scattered and confined to occasional fields. This was 

 apparently the first occurrence in such numbers since 1911. The 

 Kansas bran mash gave excellent results against the larvae, but its 

 efficacy was not greatly altered by the addition or omission of lemons. 

 Sawdust substituted for bran was less effective, its pine odour and 

 coarseness probably acting as a repellent. In the field, parasitism 

 was at first 4 per cent., but later increased to 50 per cent., Winthemia 

 quadripusttdata, F., being the most common Tachinid. It is believed 

 that the majority of larvae bearing Tachinid eggs escape by discarding 

 the eggs when they moult. When larvae bearing Tachinid eggs were 

 poisoned, the parasites were unable to develop. Muscina stabidans, 

 Fall., was also bred from larvae of L. frugiperda. 



Severin (H. C). Harlequin Cabbage Bug in South Dakota.—//. 



Econ. Ent., Geneva, N. Y., xiv, no. 3, June 1921, p. 305. 

 [Received 22nd November 1921.] 

 Attention is drawn to the establishm-ent of Murgantia histrionica, 

 Hahn, in South Dakota. It chiefly attacks cruciferous plants, but 



