298 



efficient in collecting grasshoppers of all ages, is constructed of sheet 

 iron, preferably galvanized, of reasonable thickness to ensure strength, 

 and, except for the end pieces, made of a single sheet 10 to 12 feet 

 long and 26 inches in width. The front is formed by turning up one 

 edge a couple of inches, and the back may be turned up a foot, thus 

 making a shallow pan 1 foot wide, with a back of the same height and 

 with a front 2 inches high. Ends are rivetted in or soldered. Runners 

 of old waggon tyre are placed at each end and one in the centre. This 

 latter is turned over at the front (low) and back (high) edges of the pan 

 in order to strengthen it at these points. The two side runners should 

 extend both backward and forward in order to overcome to some 

 extent, the inequalities of the ground and cause the machine to run 

 more smoothly. All three runners should be rivetted to the pan and 

 soldering around the heads of the rivets will make it water-tight. 

 The pan is filled with water, on which is poured emough kerosene to 

 cover it with a film, a horse is harnessed to the end runners, and the 

 outfit is then ready for use. By using longer, wider, and heavier 

 sheet iron a larger and stronger pan can be made and this further 

 strengthened by additional runners ; a horse can then be used at 

 each end, or the pan may be mounted on low wheels. Poisoned baits 

 may be used even when the insects breed in the lucerne fields. The 

 " Griddle mixture " [see this Revieiv, Ser. A, i, p. 453] is very efficient. 

 Another effective formula consists of : — Wheat bran, 25 lb., Paris 

 green, 1 lb., cheap molasses or syrup, 2 U.S. quarts (If Imp!.), oranges 

 or lemons, 3 fruits. The bran and Paris green should be thoroughly 

 mixed together. The juices, finely chopped skin and pulp of the fruit 

 are added to the molasses, which is then diluted with 2 U.S. gals. 

 (If Impl.) of water. These should be mixed together and enough water 

 added to bring the whole to a stiff dough. This quantity is sufficient 

 to treat from 5 to 10 acres when properly applied. The fruit is the 

 attractive part of this bait, and its omission will result in a loss of 75 

 per cent, efficiency [see this Review, Ser. A, ii, p. 542]. The bait 

 should be sow^l broadcast in strips one rod apart over the area to be 

 treated. When properly sown broadcast, neither birds nor live 

 stock can obtain an injurious or fatal amount of poison. Remedial 

 measures must be applied as soon as the insects begin to appear, if 

 they are to be successful. 



Hyslop (J. A.). Wireworms attacking cereal and forage crops. — U.S. 

 Dept. Agric, Washington, D.C.,Bu\\. no. 156, 27th January 1915, 

 34 pp., 8 figs. 



Elaterid larvae or wireworms must be included among the five worst 

 pests of Indian corn and among the twelve worst pests of wheat and 

 oats. The term " wireworm " is also, though erroneously, applied 

 to the larvae of Tenebrionidae (darkling beetles). Tenebrio molitor, L., 

 is common throughout the United States, and its larva, the mealworm, 

 feeds upon products stored in granaries and warehouses. Another 

 genus, Eleodes, is found only west of the Mississipi, and attacks cereal 

 crops in the field. The name " wireworm " is also incorrectly applied 

 to several species of millipedes. Wireworms are destructive to cereal 

 and forage crops in the larval stage only, although the adults of certain 

 species {Linionius discoideus, Lee, etc.) do considerable damage to the 



