ECONOMIC ZOOLOGY — ENTOMOLOGY. 751 



by Polyporus versicolor, gaining entrance through holes made by borers. These 

 may be killed by the insertion of a wire, after which the holes are to be given 

 an antiseptic treatment and plugged. Diseased trunks are to be burned. 



Endothia canker of chestnut, P. J. Anderson and W. H. Rankin {yew York 

 Cornell Sta. Bui. 3-)7 (1914), pp. 531-618, pis. 5, figs. 25).— The authors give the 

 results of an extended investigation on the disease of chestnut due to E. para- 

 sitica. 



After giving an account of the economic value of the chestnut, its soil require- 

 ments, and natural reproduction, the disease is described, its origin, spread, 

 symptoms, and pathology being considered at length, and suggestions are given 

 for its control. Under the last topic the authors state that there is nothing 

 now known that will prevent the extermination of the American chestnut tree 

 from this cause and that every measure of control that has been tried has been 

 abandoned north of West Virginia and the Potomac River. 



An extensive bibliography is appended. 



Two trunk diseases of the mesquite, H. von Schkenk (Ann. Missouri Bot. 

 Gards., 1 {WW, No. 2, pp. 2^3-252, pis. 2).— The author gives a description of 

 the effects produced by Polyporus texanus on mesquite near San Antonio, Tex., 

 with a description of the fungus. Fomes i-iniosus was also found in one in- 

 stance on a mesquite in the same locality. 



A bibliography is appended. 



ECONOMIC ZOOLOGY— ENTOMOLOGY. 



Bird houses and how to build them, N. Dearborn (17. 8. Dept. Agr., Farmers' 

 Bui. 609 (1914), PP- 19, figs. ^8). — This publication, prepared with a view to 

 encouraging the protection and study of birds, gives plans for the construction 

 of various forms of bird houses. 



Physiological investigations of insect pests, J. Dewitz (Naturw. Ztschr. 

 Forst u. Lanxhv., 11 i.1913), Nos. 3, pp. 129-U3; 9, pp. 431-UO).— The first part 

 of this paper has been noted from anotlier source (E. S. R., 28, p. 752) ; the sec- 

 ond part deals with the arrest of the growth of insect larvje. 



The compatibility of insecticides and fungicides, G. P. Gray (Better Fruit, 

 9 (1914), No. 2, pp. 9, 10, 35-42; Mo. Bui. Com. Hort. Cal., 3 (1914), No. 7, pp. 

 265--275). — This discussion includes a classification of the various mixtures and 

 gives a compatibility table. 



Report of entomologist, J. R. Watson (Florida Sta. Rpt. 1913, pp. LIV- 

 LXXI, figs. 4). — The author first reports upon spraying experiments with 

 Microcera in continuation of those previously noted (E. S. R., 29, p. 251), the 

 general results of which were about the same as those tabulated in the previous 

 report. 



In a discussion of white fly conditions in various groves the author states that 

 during the past two years in the groves under observation the fungi, especially 

 the brown fungus, have done excellent execution, amounting in most cases to 

 practical control so far as the summer brood is concerned and often the fall 

 brood as well. The woolly white fly (Aleyrodes hoicardi) spread rapidly during 

 the year, at the close of which it was found in groves as far east as Orlando. 

 In some groves it is becoming so abundant as to be fully as serious a pest as A. 

 citri and is much more resistant to parasitic fungi than either A. citri or A. 

 nuUfera. Two chalcidid species are said to parasitize it, one of which is quite 

 common. 



Observations of other citrus insects, including Icerya purchasi, Leptothrips 

 floridensis. Heliothrips hwmorrJioides. Pachnwus opalus, and Trirhahda hrenl- 

 oollis. are briefly reported. Under the heading of destructive insects for the 



