433 



abundant species, A. sputator, L., being also recorded from the same 

 districts, with the exception of Westmoreland. A. sohrinus, Kiesenw., 

 and A. pallidulus, IlUg., though not Ukely to be classed among the 

 dangerous pests, may be found fairly commonly in Hertfordshire by 

 sweeping the early umbelhferous flowers. 



Metcalf (M. M.). Poisoning Tree Parasites with Cyanide of Potassium. 

 — Science, Lancaster Pa., xlvii, no. 1214, 5th April 1918, 

 pp. 344-345. 



The method of killing insect pests of fruit trees by placing potassium 

 cyanide under the bark having been stated to cause the death of the 

 tree within two or three years, the author has made experiments 

 on these lines on scale-infested apple and pear trees. In each of six 

 trees half-inch holes were bored, which were filled with chemically 

 pure potassium cyanide and then plugged up. Four of these trees 

 were apparently dying, but during the summer they began to recuperate 

 and all six became free from scale, and have continued healthy and 

 vigorous during the ensuing three years. 



The effectiveness of the treatment as a pest exterminant, 

 however, remains doubtful, as during the same season the scale 

 disappeared from other infested, but untreated trees. 



Howard (L. 0.). The Contribution of Zoology to Human Welfare. — 



Science, Lancaster, Pa., xlvii, no. 1215, 12th April 1918, 

 pp. 349-354. 



It has been computed that the entomologists of the United 

 States Department of Agriculture have contributed as their share 

 towards the welfare of humanity an annual saving to the country 

 of £100,000,000, by the introduction and continual improvement 

 of remedies against insect pests attacking growing and stored 

 crops. 



Those working in the equally important field of medical zoology 

 are now beginning to receive more and more consideration from 

 sanitarians. 



Benedict (R. C). The Yellow Clothes Moth. — Science, Lancaster, Pa., 

 xlvii, no. 1216, 19th April 1918, p. 392. 



Since the pubhcation of a previous paper on the yellow clothes 

 moth [Tineola biselliella] [see this Review, Ser. A, vi, p. 48] the author 

 finds that the fact that the first brood of each year is mainly derived 

 from eggs of the preceding year had already been recorded by Professor 

 Herrick. 



Although the moths may emerge in every month of the year, there 

 are two periods of special abundance, the first from the end of April 

 to the end of June, and the second from late August to the end of 

 September. The actual hfe-cycles occupy approximately 3| months 

 (June to 15th September), and 8| months (15th September to June). 



Turner (W. F.). Nezara viridula and Kernel Spot of Pecan. — Science, 

 Lancaster, Pa., xlvii, no. 1220, 17th May 1918, pp. 490-491. 



Nezara viridula, L. (green soldier bug) is of common annual 

 occurrence throughout middle and southern Georgia and in some 



