858 EXPERIMENT STATION RECORD. [Vol. 3S 



A method of graphically illustrating the distribution of injury by an 

 insect pest, F. Z. Haktzell {Jour. Econ. Ent., 11 (1918), No. 1, pp. 32-39, figs. 

 2). — The method devised by the author is described, the grape flea-beetle being 

 used in giving a practical explanation of its application. 



Toxicity of volatile organic compounds to insect eggs, W. Mooke and S. A. 

 Gbaham (TJ. S. Dept. Agr., Jo,ur. Agr. Research, 12 (1918), No. 9, pp. 579-587).— 

 Investigations conducted at the Minnesota Experiment Station, here reported, 

 are summarized by the authors as follows: 



" In general compounds with high boiling point and slight volatility are more 

 effective in dipping and spraying insect eggs than compounds with low boiling 

 point and high volatility. Compounds with low boiling points kill freshly laid 

 eggs more readily than eggs in which the embryo is partially or fully developed. 

 Compounds of higher boiling points are more toxic to eggs with fully developed 

 embryos than they are to eggs in which the embryo is only slightly formed. 

 Kerosene containing both high and low boiling points is destructive to both 

 young and old, but is only slightly toxic to partially developed eggs. The 

 toxicity of the vapor or organic compounds to insect eggs is related to the 

 boiling point and the volatility. As the boiling point increases and the vola- 

 tility decreases the toxicity increases." 



A list of 10 references to the literature is appended. 



The influence of molasses on the adhesiveness of arsenate of lead, ^. Ti. 

 Haetzell {Jour. Econ. Ent., 11 {1918), No. 1, pp. 62-66). — In reporting upon 

 the results of adhesive tests it is stated that the success which attended earlier 

 experiments was probably due to the lack of rain immediately following the 

 application of the spray mixture containing molasses. In field work excellent 

 results have been secured from the use of molasses and arsenate of lead in the 

 control of the grape root-worm through studying tlie weather conditions and 

 applying the spray at a time when there is little probability of rain, and by 

 following the first spraying in a'bout one week with an application of Bordeaux 

 mixture and lead arsenate to act as a repellent to invading beetles which might 

 enter the vineyard during the dispersion period. It is recommended that the 

 weather conditions be observed and the molasses and arsenate of lead mixture 

 applied at a time when freedom from rain is to be expected for at least three 

 or four days. 



Spreaders for arsenate sprays, A. L. Lovett {Jour. Econ. Ent., 11 {1918), 

 No. 1, pp. 66-69). — In preliminary tests at the Oregon Experiment Station sage 

 tea and a casein lime mixture gave the least burn and approximated the ideal 

 sought for in a spreader. 



Appearance of the male Carausius morosus and its longevity, G. Foxjcheb 

 {Compt. Rend. Acad. Sci. [Paris}, 165 {1917), No. 16, pp. 511-513).— This paper 

 relates to an orthopteran which is a remarkable example of parthenogenicity. 



The eggplant lace bug in Porto Bico (Corythucha monacha), R. T. Cotton 

 {Jour. Dept. Agr. P. R., 1 {1917), No. 8, pp. 170-173).— An. account of studies 

 of C. monacha, which is the worst of the many insect pests of the eggplant in 

 Porto Rico. 



A key to the species of the genus Ceresa occurring north of Mexico and 

 the description of a new species, E. H. Gibson and Emma Wells {Bui. Brook- 

 lyn Ent. Soe., 12 {1917), No. 5, pp. 110-118). — A key is given for the separation 

 of 17 species of membracids of the genus Ceresa, known to occur north of 

 Mexico, of which the species Ceresa militaris from Missouri is described as 

 new. 



Notes on three species of apple leaf-hoppers, F. H. Lathrop {Jour. Econ. 

 Ent., 11 {1918), No. 1, pp. 144-148, figs. 5).— This is a brief report of observa- 

 tions at the New York State Experiment Station on the life history and habits 



