THE CANADIAN ENTOMOLOGIST' 250 



RECENT CANADIAN PUBLICATIONS. 



CLASS BOOK OF ECONOMIC ENTOMOLOGY — By Wm. Lochhead, (P. Blakiston's 

 Son & Co., Philadelphia). 



This compact book of 436 pages, many of them in reduced type, covers a 

 wider scope of Entomology than any text book we have seen. 



Part I (65 pages) deals with the structure, growth and economics of insects> 

 and is of special interest and value, not only because it describes in much more 

 detail than usual the external and internal anatomy — especially the various 

 types of mouth-parts — but also because it brings together in a clear and concise 

 way much valuable data on such interesting subjects as beneficial insects, dis- 

 tribution of insects, insects and disease, and methods of studying insects. 



Part II contains tables for the identification of insects injurious to farm, 

 garden and orchard crops, separate tables being made for each host plant. 

 Cross references are also given with each insect to the pages in the latter part 

 of the book where such insect is described in more detail. This enables the 

 student to verify his determinations. Tables of this nature though difficult 

 to construct and seldom satisfactory would appear to be a valuable feature in a 

 book of this nature. 



Part III, the main part of the book (280 pages), deals with the classification, 

 description and control of common insects. The old classification has been 

 revised and brought up to date. Each order is treated in considerable detail 

 and keys given not only to the families likely to be met with by the student, 

 but also in many cases to the genera and in a few cases to the most common 

 species. These keys should prove a boon to teacher and student. 



Under each family the insects of economic importance are described and 

 an account given of their life-history and the method of control. The total 

 number of insects thus dealt with is large, possibly somewhat larger than 

 necessary- . 



Towards the end of this part a few pages are assigned to the near relatives 

 of insects, especially such pests as red spiders, sow- bugs, millipedes, slugs and 

 eelworms. Control measures for these are also indicated. 



Part IV discusses, in a general way, the control of injurious insects under 

 such subjects as factors of control, cultural or preventive methods, artificial 

 methods, insecticides, spraying, etc. 



Although there are 257 illustrations, all of them good and valuable, more 

 would have added to the merits of the book even though this meant an increase 

 in size. 



The compilation of a work of this nature, embracing so many aspects of 

 Entomology, must have involved an enormous amount of labour and time, 

 and the author is to be congratulated on the clear, concise way in which he has 

 accomplished his task. The book has many merits and should be of great 

 assistance in furthering the study of Entomology. Its chief defect so far as 

 one can judge without having tested it in the class-room, would appear to be 

 that an attempt has been made to include too many subjects, and while most 

 of these have been well treated, the so-called strictly economic aspect of the 

 work — the life-histories and control measures — have been somewhat sacrificed 

 to the necessity for brevity. L. Caesar. 



