190 ENTOMOLOGICAL NEWS [xxxii, '21 



continuous, circular band approximately 2 inches from the tree (never 

 closer than 1 inch) on smooth ground about the base of the tree. If 

 indications point to the presence of borers from 1 to 6 inches above 

 the ground, the soil should be mounded about the tree so that the upper 

 level is even with the highest point where the gum is exuding. The 

 application then should be made on the new soil level. After the crys- 

 tals are distributed, several shovels of earth should be placed over 

 them and packed down with the back of the shovel. This earth should 

 be free of weeds, grass, large stones, etc. In New Jersey, the best time 

 of application is from Augus*t 25th to September 10th. 



Paradichlorobenzine is a white, crystalline substance occurring as a 

 by-product in the manufacture of monochlorobenzine. It is insoluble 

 in water and evaporates slowly at ordinary temperatures (70 degrees 

 F.). The gas is heavier than air, non-poisonous to man under ordi- 

 nary conditions, but toxic to insects during long exposures. 



The paper is accompanied by. a series of photographs, showing the 

 correct and incorrect ways of applying the insecticide. It is to be re- 

 gretted that Dr. Peterson's interesting and valuable paper could not 

 have appeared in a journal devoted entirely to entomology, although 

 a wide" distribution of separates will overcome this drawback in part. 

 While the paper in question deals in part with such factors as soil tex- 

 ture, moisture, temperature, etc., in so far as they have a bearing on 

 the effectiveness of the fumigant, the paper is really a contribution to 

 our knowledge on the control of the peach-tree borer and as such, is 

 of importance mainly to entomologists. One of the results of the 

 "shortage of entomological space" is a tendency on the part of authors 

 to publish their material wherever facilities are afforded, and this means 

 a greater scattering of the literature and, to a certain extent, inaccessi- 

 bility for many workers. HARRY B. WEISS, New Brunswick, New Jer- 

 sey. 



THE COCCIDAE. Tables for the Identification of the Sub-families and 

 some of the more Important Genera and Species, together with Discus- 

 sions of their Anatomy and Life History. By Prof. ALEX D. MAcGiLLi- 

 VRAY. Pages I-VIII, 1-502, Scarab Co., Urbana. 111. 1921. $6.00 

 Those of Prof. MacGillivray's associates, students and friends who have 

 long known of his plan to prepare a volume on the Coccids will wel- 

 come the appearance of the finished work. The complete title of the 

 book really leaves little to be said concerning its scope, for it is at once 

 a thorough morphological and taxonomic treatise of the family, the 

 keys extending in many instances as far down as the species. In some 

 sections considerable is given concerning the life history and economic 

 status of the groups and species under discussion. Since most of the 

 keys have been used extensively by advanced students taking work under 

 Prof. MacGillivray, it has thus been possible to revise them from time 



