ISS THK t ANAUIAN ENToMoUHIIHT. 



and those between ants and aphids, and the interrelatiors of gall insects. 

 In the third homology and phytogeny are illustrated by studies of ihe 

 wing-veins of three scries of closely allied insects. In Chapters V and V'l, 

 as the headings suggest, entomology takes a prominent part. A special 

 feature of Chapter VI is a number of practical studies of aquatic animals, 

 mainly insects, which are partici.larly well suited to the study of secondary 

 adapiaiions to environment. .\s examples of these studies may be 

 mentioned the following : 



'* The principal types of gills found in aquatic insects." 



*' The comparative development of respiratory apparatus in aquatic 

 insect larv.-e." 



" A comparison of the structure of ground beetle and diving beetle." 



" A comparative study of the size and activities of diving beetles." 



•' Field observations on diving beetles." 



" The adaptive structures of diving beetles." 



Animal coloration is also chiefly illustrated from insects, and forms 

 the subject of one of the practical field studies. It is treated under four 

 headings : Resemblance, Flash Colours, Warning Coloration and .Mimicry, 

 each of which is illustrated by examples easily obtainable by the general 

 student. 



In the last chapter, which deals mainly with psychological phenomena, 

 the nature of instinct is analyzed by experiments ©n the reactions of cater- 

 pillars in dilTerent bodily states to various stimuli, and on the case-building 

 habits of caddis-flies. 



In the appendix, in which directions are given for handling the micro- 

 scope, dissecting, etc., a key to the genera of North .American Dytiscidae 

 is included as an aid in the studies of diving beetles mentioned above. 



The book is eminently readable, the style being lucid and vigorous, 

 and is fairly free from typograj>hical etrors. The numerous illustrations 

 arc largely original, and include a number of good photogravures. 



.Mailed May 7(h, igio. 



