THE CANADIAN ENTOMOLOGIST. 159 



require more than one summer. With us it is only the fully developed 

 females which survive from one year to the next ; in spring they form the 

 new nest, lay eggs, and bring up the larvae which develop into workers, 

 and thus begin to contribute to the support of the family, whence at last 

 towards autumn males and females are developed. It seems hardly 

 credible that all this can happen each summer in a similar way at Grin- 

 nell Land, in latitude 82°, especially as there the supply of food must be 

 less than with us. Hence, the development of a colony of Humble-bees 

 must there be something quite different. 



Were it not satisfactorily established that Humble-bees do occur in 

 such high latitudes, one might, from our knowledge of their mode of life. 

 be disposed to maintain that under such conditions they could not live. 



They seem, however, to have one advantage over their more Southern 

 brethren. In the Arctic regions they do not seem to be troubled with 

 parasites, such as Conops, Muti/ia, which help to diminish their numbers 

 in other countries. 



BOOK NOTICES. 



Revised Catalogue of the Diurnal Lepidoptera of America North of 

 Mexico, by Wm. H. Edwards, 8vo., pp. 95. From Transactions of the 

 American Entomological Society, 1S85. 



This revised catalogue of American butterflies was greatly needed. 

 Since Mr. Edwards published his first catalogue in 1877, much new 

 material has accumulated, more than a hundred new species have been 

 described, while a vast amount of information has been published on the 

 preparatory stages and habits of these insects. Much of this has been 

 communicated by the author of the catalogue himself, who has brought an 

 amount of enthusiasm to bear on this interesting field of research exceed- 

 ing that of any of his predecessors or co-laborers, while his full and 

 accurate descriptions have been everywhere appreciated. Other excellent 

 workers have also added to our stock of knowledge in this department, to 

 all of which ready reference is had by the use of this catalogue. The new 

 edition gives fuller references with dates, whereas the former catalogue 

 gave no date. Many corrections are made in the synonymy, the result 

 of a careful scrutiny by the author of every species in the entire list ; 

 the localities also are given with greater fullness. A large propor- 



