ENTOMOLOGY. 63 



grapes, and nursery rows at Troy; Oberea bimaeulata, a larva of which 

 was found boring iu an apple twig and its method of work noted ; Ram 

 amelis virginiana, the larva' of which were found similarly boring in a 

 twig of witch-hazel; Gonotrachelus posticatus, which was reared in great 

 numbers from a lot of acorns of Quercus alba; and the grape-root worm 

 (Fidia viticida), still a pest in the vineyards along Lake Erie, notwith- 

 standing the increased numbers of parasites. An experiment with 

 tobacco dust a»d kainit as remedies against this pest is noted, which 

 showed that the kainit can scarcely be applied strong enough to be 

 effectual. 



On the preparation and use of arsenate of lead, A. H. Kirldand (pp. 

 4G-49). — To make 10 lbs. of arsenate of lead in 150 gal. of water, as 

 used in the work against the gypsy moth, there is required about 13 lbs. 

 2i oz. of acetate of lead and 5 lbs. 7§ oz. of arsenate of soda. The 

 relative amounts of these two salts must be governed by their purity. 

 The best results are obtained by preparing the poison according to the 

 method described in the paper read by the author at the last meeting 

 (E. S. R., 9, p. GGO). The method of weighing the salts in connection with 

 the gypsy moth work is noted. The cost of the lead mixtures is about 

 01 cts. per pound, exclusive of freight, labor, boxing, etc., which latter 

 factors it is thought should not increase the cost over J ct. a pound. 

 A 25-gal. galvanized iron tank has been found more convenient in wood- 

 lands than a larger one. To prevent clogging a strainer of wire gauze 

 with 70 meshes to the inch is used, and for the same purpose a wire 

 gauze strainer is inserted in the nozzle of the spraying apparatus. 

 Arsenate of lead when applied to foliage in the form of a spray is shown 

 to be very permanent. Even in unfavorable weather from GO to 80 per 

 cent of larvae are destroyed. Three to four pounds of the mixture are 

 equal in effect to 1 lb. of Paris green, but it is nevertheless a cheaper 

 remedy. Another arsenate of lead, the diplumbic arsenate, has been 

 prepared from nitrate of lead and arsenate of soda at a somewhat 

 smaller cost than that noted for the arsenate of lead. 



Notes on the malodorous ea rabid, Nomius pygmceus, W. B. Barrows 

 (pp. 49-53). — A very offensive odor was traced to this beetle. 



Notes on insecticides, C. L. Marlatt (pp. 54-63). — Soaps, resin washes 

 and compounds, pure kerosene, kerosene emulsion; the lime, salt, and 

 sulphur wash; hydrocyanic-acid gas, steam and superheated water, 

 arsenicals, and lime are discussed. No more unsatisfactory material for 

 work against insects can be found than soft soap. The formulas often 

 given are criticised as calling for too large an amount of water. 

 Experiments have shown that an addition of 1 oz. of lime for each 

 quart of diluted soap will render soap fluid when cold, even when 

 in strong solution. Experiments in making a soap with potassium 

 hydrate and oil are mentioned. For trees five years old and under 1 

 gal. of resin Mash is thought sufficient per tree, while for trees twenty 

 to thirty years old G or 8 gals, may be necessary. Several formulas are 



