V 



585 



PrionoxysLus robiniae (carpenter worm), Aegeria {Sesia) acerni (maple 

 sesia), Plagionotus speciosus, Chermes pinicorticis (pine bark aphis), 

 Pissodes strohi (white pine weevil), Chermes similis and C. ahielis 

 (spruce gall aphids), Torlrix fumijerana (spruce bud- worm), Lophyrus 

 abieiis (spruce or fir saw-fly), Coleophora laricella (larch case-bearer), 

 Chermes slrohilohius (larch woolly aphis), Lygaeonematus erichsoni 

 (larch saw-fly) and Mindarus abietinus (balsam twig aphis). 



LocHHEAu (W.). Useful Keys to some Economic Families of Insects. 



— 7th Ann. Kept. Quebec Soc. Prot. Plants from Insects and Fung. 

 Dis. (1914-1915), Quebec, 1915, pp. 135-142. [Received 4th 

 August 1915.] 



These keys refer to certain genera of economic importance in the 

 following famihes : — Sphingidae, Tabanidae, Trypetidae, Ceram- i| 

 BYCiDAE, Curculionidae, Scolytidae, Blattidae, Acridiidae, 

 Tettigoniidae and Gryllidae. 



Grossman (S. S.) & Wolcott (G. N.). Control of the Changa. —Po>7o -^ 

 Rico Agric. Insular Expt. Sta., Rio P iedras', Giro. no. 6, 1915, 3 pp. 



After numerous experiments covering a period of several years, a 

 very easy, cheap and effective method of destroying the " changa " 

 or mole-cricket {Scapterisci.s didactylus, Latr.), which is so injurious 

 to tobacco, sugar-cane, and vegetable crops in Porto Rico [see this 

 Review, Ser. A, i, pp. 185 and 324], has been discovered as the result 

 of a suggestion made by an official of the Porto Rico Leaf Tobacco 

 Gompauy. A poison-bait was prepared with 100 lb. of low grade 

 flour and 2| or 3 lb. of Paris green. The bait was then placed in a 

 ring around the tobacco plant which it w^as intended to protect, in a 

 shallow trench about 1 inch deep and 3 inches from the plant. Care 

 should be taken not to place the bait nearer than this to the plant or 

 to drop any on the leaves, as it scorches the plant severely. In a 

 vegetable garden, broadcast distribution is more suitable, the bait 

 being scattered at the rate of from 250 to 300 lb. per acre. The area 

 to be treated must be first ploughed and thoroughly broken up, so 

 as to be as free as possible from vegetable matter at the time the 

 mixture is applied, which should be not less than a week later. Four 

 or five days should then be allowed before planting, to give the 

 mole-crickets ample time to feed and die. This method was tried on 

 tobacco and would be just as effective with any other crop, such as 

 sugar-cane or vegetables, and is easier of application than the ringing 

 system. A sufficient quantity of bait to destroy all the mole-crickets 

 on an acre of tobacco by either of the two methods is 300 lb., and the 

 cost, including labour, is from 32 to 40 shillings. This bait is now 

 extensively used in Porto Rico. 



Horton(J. R.). Control of the Citrus Thrips in California and Arizona. 



— U. S. Depf. Aijric, Washington, IJ.C, Farmers' Bull. no. 674, 

 8th July 1915, 15 pp., 7 figs., 1 table. 



Scirtothrips (Euthrips) citri during the past few years has done 

 seiioas damage to citrus fruits in the San Joaquin Valley of California. 



