1919] ECONOMIC ZOOLOGY ENTOMOLOGY. 661 



ductlon to a Graphic Formula of the Biology of Insects, by L. Rhutnbler (pp. 

 335-346) ; The Control of Files, by E. Teichinann (pp. 347-365) ; Control of 

 the Webbing Clothes Moth (Tincola MselUella) by Hydrocyanic Acid Gas, by 

 A. Andres (pp. 366-368) ; The Use of Insects in Medicine, by F. Heikertinger 

 (pp. 369-373) ; Thereva noMlitata, a New Enemy of Rye, by Klelne (p. 373) ; 

 and An Outbreak of Orthena insignis at the Royal Botanical Garden at Berlin- 

 Dahlem, by F. Schumacher (p. 374). 



Insect pests of the rosella, E. Jarvis {Queensland Agr. Jour., 12 {1919), No. 

 2, pp. 69-74. flff'^- 11)' — This paper deals particularly with the roselle flea-beetle 

 {Nisotra breiveri), which has found Hibiscus sabdariffa more attractive than 

 Its own native food plant Commersonia eetiinata. While N. breioeri Is the only 

 really destructive insect encountered by the author in Queensland at the 

 present time, several other species also occur on the foliage of roselle at 

 Meringa, namely Lagris cyanea, Rhyparida discopunctulata, Euproctis sp., 

 Dysdercus sp., and AgonosceUs rutilia. 



Common insecticides. — Their practical value, H. F. Wilson {Wisconsin Sta. 

 Bui. 303 {1919), pp. 15, figs. 5). — The data presented In this bulletin are based 

 upon a series of tests made by the author at the Oregon and Wisconsin experi- 

 ment stations. These tests were made primarily to determine the comparative 

 values of Paris green, arsenlte of zinc, arsenate of lead, and calcium arsenate In 

 the control of the Colorado potato beetle. The results are presented in tabular 

 form, and a chart is given in which data relating to these insecticides are 

 graphically compared. 



In the course of the work 18 different arsenicals were examined, including 

 both simple arsenicals and proprietary insecticides and the materials used in 

 their manufacture. These are grouped in three classes: (1) Those having no 

 killing efficiency (Prince's mineral, iron oxld, and slllcia) ; (2) those having 

 a slight degree of killing efficiency (basic lead sulphate, lead oxld, zinc oxid, 

 and the compounds of zinc oxld plus lead oxid, and zinc oxld plus lead oxid 

 plus iron oxid) ; and (3) those having a high degree of killing efficiency (Paris 

 green, lead arsenate, calcium arsenate, zinc arsenlte, Bug Death, Kllng Kill, 

 Tuber Tonic, and Insecto). 



" Paris green and a special brand of lead arsenate gave the best results, 

 with practically a 100 per cent killing efficiency within 24 hours. Ordinary 

 arsenate of lead is second, and zinc arsenlte and calcium arsenate are a 

 trifle slower than the others. The materials known as Bug Death, Kling Kill, 

 Tuber Tonic, and Insecto are proprietary compounds which contain as the active 

 Ingredient either lead oxid, zinc oxid, or some arsenical compound. They are, 

 therefore, merely diluted combinations of poison and have no advantage ovei 

 a good grade of arsenate of lead or calcium arsenate. Summarizing, Paris 

 green is the material with the greatest killing efficiency, but it is little better 

 than a certain brand of arsenate of lead. Ordinary brands of arsenate of lead, 

 zinc arsenlte, and calcium arsenate are a trifle slower In action, but are suffici- 

 ently efficient for all practical purposes for the control of the Colorado potato 

 beetle." 



On potatoes Paris green without lime was the only spray that caused any 

 marked damage. On apple foliage It has been found that both calcium arsenate 

 and Paris green cause injury to the foliage unless they are combined with 

 equal parts of lime, lime-sulphur, or Bordeaux mixture, but when so combined 

 no burning was detected. 



Derris as an insecticide, N. B. McIndoo, A. F. Sievers, and W. S. Abbott 

 {Jour. Agr. Research [U. S.], 17 {1919). No. 5, pp. 177-200).— This is a report of 

 investigations of Deguelia [Derris] spp. as an insecticide, conducted coopera- 



