32 THE CANADIAN ENTOMOLOGIST 



shewing the head in profile, and the neuraticn of both wings. Ten 

 excellent plates in cclour are given portraying 350 species. 



The collaboration of three specialists of such recognized 

 standing as Lord Walsingham, Mr. J. H. Durrant, his assistant, 

 and of Mr. August Busck, has resulted in a valuable production 

 which commands careful and respectful consideration. 



The conclusion that secondary sexual characters should be 

 discarded, as a means for delimiting genera, while not a new one, 

 as stated by the author, has not won the universal approval that 

 should be accorded it. Lord Walsingham is, therefore, to be con- 

 gratulated on having been the first to apply this principle in such a 

 comprehensive manner. A list of genera in which these characters 

 are eliminated as a means of generic classification has, of course, 

 led to the sinking of a number of old and v/ell established names as 

 synonyms. Under Eucosma Hb., for example, are placed such 

 familiar names as Epiblema Hb., Epinotia Hb., and Thiodia Hb. 



The bibliographical work has been done most thoroughly 

 and will make this work indispensable to all who specialize within 

 the groups treated. 



Attention is called, by the author, to the necessity for more 

 careful work in the description of neuration, and to the fact that 

 it is necessary, in most cases, to denude the wing and study it 

 under the miscroscope. This is undoubtedly true and too much 

 reliance should not be placed upon descriptions based upon older 

 and more inadequate methods. The writer wishes to call particular 

 attention to the helpfulness of the many drawings illustrating the 

 text, and regrets that it was not possible to carry out this plan of 

 illustration for every genus described as new. An adequate verbal 

 description of the neuration of a new genus, for example, is doubt- 

 less possible, but doubtless also it is seldom, if ever, given. 



The writer is informed that, by an unusually.-thoughtful 

 arrangement, drawings of unique types were placed, where Speci- 

 mens of the insects were lacking, with either the British or the 

 United States Museum. This feature has added greatly to the 

 usefulness of the book itself and of the collections of the two 

 museums mentioned. 



