1919] ECO:NrOMIC ZOOLOGY ENTOMOLOGY. 457 



Fighting the walnut aphis, R. W. Hodgson (Cal. Cult., 53 {1919), No. 3, p. 

 53, fig. 1 ) . — The author describes a new dusting method for controlling the rav- 

 ages of the walnut aphis as worked out by R. B. Smith, which consists in the 

 use of a dry dusting mixture of 74 per cent kaolin and 24 per cent hydrated 

 lime upon Avhich 2 per cent of nicotin sulphate has been spi-ayed. This mix- 

 ture is blowTi onto the trees by means of a duster, driven by a 3 h. p.-gasoline 

 engine. The average application per tree of from 2 to 3 lbs. of the material 

 gives a kill of 95 per cent. The mixture is prepared at a cost of 5 cts. per 

 pound and from 20 to 40 acres can be dusted per day, depending upon the size 

 of the trees and the way in which the rig is set up. 



" The kill is effected largely by the fumes and is very rapid, as within a few 

 minutes after dusting clouds of dead aphis may be seen falling from the trees. 

 The zone of effective killing is comparatively large, as for two or three rows 

 beyond the dusted area the trees will be found to be comparatively free from 

 aphis." 



The results of the work in 1919 clearly indicate that it is possible in this 

 way to control the pest effectively. The method has reduced the cost more 

 than one-half, and made it possible to get over the orchard from five to six 

 times as fast as formerly. 



It is pointed out that as reinfestation from adjoining infested orchards will 

 take place in a few days the control of the walnut aphis is a community prob- 

 lem. " With the new method it seems possible to cover quickly and effectively 

 a large enough acreage to make one application sufficient. This is apparently 

 A^^at has occurred this past season in Santa Barbara County, it being reported 

 that practically every ochard in the county was dusted." 



" The new method also gives promise for successful control of the new cod- 

 ling moth worm for which it is now being used in infested areas, dry powdered 

 lead arsenate being added to the aphis dusting compound." 



The Aphididse of Lahore, Bashambar Das {Mem. Indian Mus,, 6 (1918), No. 

 4, pis. 18). — The plates here published illustrate the work previously noted 

 (E. S. R., 40, p. 650). 



Host list of fluted or cottony cushion scale, G. B. Mekbilt. (Quart. Bui. 

 Plant Bd. Fla., 3 (1919), No. 4, pp. 125-133) .—This is a compilation of the hosts 

 of the cottony cushion scale. 



A contribution to the knowledge of the Coccidae of southwestern United 

 States, G. F. Feeeis {Leland Stanford Jr. Univ. Pubs., Univ. Sen, 1919, pp. 68, 

 flffs. 38). — This report is based, for the most part, upon material collected by 

 the author in the course of an extended tour through the arid southwestern 

 portion of the United States during an investigation of the abundance and dis- 

 tribution of a lac-producing scale insect, Tachardia larrew. 



Of the 59 species representing 33 genera noted, 13 are described as new to 

 science. 



Lice and their menace to man, L. Lloyd (London: Henry Froiode and Hoddcr 

 rf Stovghton, 1919, pp. XIII +136, figs. 17).— This book brings together the 

 present status of knowledge of lice for the general reader. Following an intro- 

 duction the several chapters deal with the^ subjects as follows : Structure of 

 the body louse, life history and habits, dissemination of the body louse and 

 lousiness, disinfestation, the head louse, the crab louse, increased migration of 

 body lice in fevers, relapsing fever, typhus fever, and trench fever. A subject 

 index is included. 



An investigation of the louse problem, W. Mooee and A. D.. Hikschfelder 

 (Utiiv. Minn., Studies Biol. Sci., No. 3 (1919), pp. 86, pi. 1, figs. 7). — The details 

 of the investigation here reported are briefly summarized by the authors as 

 follows : 



