THE CANADIAN ENTOMOLOGIST. 159 



duplication which sometimes cannot be avoided if the insects are 

 grouped according to host plants, owing to many of the common 

 species feeding on several species of plants. Insect pests of the 

 household and of stored products are also described. 



In chapters of varying lengths the morphology, internal struc- 

 ture, senses and behaviour, metamorphoses, classification and 

 means of dissemination are described in language devoid of techni- 

 calities that might confuse the general reader. The preventive 

 measures are well discussed, and the chapters on insecticides and 

 fumigants and the methods of applying them form a useful section 

 of the book and increase its value as a book of reference for those 

 who have to deal with insect pests. A list is given of references 

 to bulletins and reports containing detailed descriptions of the 

 insects described in the book. An idea of the large number of 

 insects which the author considers may be gathered from the fact 

 that the index to the book covers twenty-four pages. 



Covering the large field that it does, it is not surprising that 

 inaccuracies occur, and space forbids a detailed reference to the 

 same. In compiling information of so varied a character, greater 

 care is necessary than when the information is the result of personal 

 knowledge A work of this character is an enormous undertaking 

 nowadays, and we cannot but feel that the author would have pro- 

 duced a better book had he spent more time in its preparation. 

 Nevertheless it will be a useful book, and the author deserves our 

 thanks. 



C. G. H. 



DOLICHOPODID.E IX LuNDBECK's "DiPTERA DANICA." 



DiPTERA Danica. — Genera and species of flies hitherto found 

 in Denmark. Part lY., Dolichopodidse. By William 

 Lundbeck; 416 pp., 130 figs. (Copenhagen, G. E. C. Gad; 

 London, William Wesley & Son.) Dec, 1912. S4.25. 



After a lapse of two years since the previous part of this 

 work appeared (reviewed in this journal. Vol. 43, April, 1911), the 

 author gives us the fourth part, which treats of the single family 

 Dolichopodidse. Most entomologists know these small, usually 



