THE CANADIAN ENTOMOLOGIST 195 



BOOK NOTICE. 



"The Importation Into the United States of the Parasites of 

 THE Gipsy Moth and the Brown-Tail Moth: A Report of 

 Progress, with some consideration of previous and concurrent 

 efforts of this kind." By L. O. Howard and W. F. Fiske. 

 Bull. 91, Bureau of Entomology, U.S. Dept. of Agriculture, 

 344 pp., 27 plates, 74 text figs., 3 maps. July, 1911. 



Perhaps no recent entomological undertaking has been watched 

 with greater interest by American and Canadian entomologists 

 than the attempt to establish on the American Continent the 

 natural enemies of the Gipsy and Brown Tail Moths. This in- 

 terest is due to two things: the immense destruction caused by 

 the two insects in Massachusetts and the southern portion of New 

 Hampshire and Maine, and to the fact that it is the first serious 

 attempt to introduce all the effective insect enemies of a Lepi- 

 dopterous host from one country, or series of countries, into another 

 that has been made in the history of entomology. 



The story of the work of introducing these insect enemies, 

 together with that of previous and concurrent efforts of the same 

 nature, is, as the title indicates, told in the Bulletin under con- 

 sideration. 



The first part consists of a discussion of previous work in the 

 practical handling of natural enemies of injurious insects. It is ah 

 able discussion including many original and valuable observations. 

 It presents, for the first time, a comprehensive view of the results 

 that have attended the artificial transportation of insect parasites 

 of various hosts in different quarters of the globe. 



The second part tells the story of the introduction into the 

 United States of the natural insect enemies of the Gipsy and Brown 

 Tail Moths. The reasons for attempting the work are given at 

 length, and the main issues of the experiment are fully discussed. 

 Biological and other notes on a small army of parasites are recorded. 

 Although the discussion is primarily that of the parasites of two 

 Lepidopterous hosts, yet, on account of the fact that the author 

 brings to bear upon the subject a splendid grasp of the broad sub- 

 ject of insect parasitism, it has a wide biological significance. 



