THP: CANADIAN ENTOMOLOGIST. 19 



This article, however, is not intended to suggest any limitation in the 

 classification, but merely to ascribe to these indefatigable laborers the 

 designation which they have earned in the very infancy of human obser- 

 vation. 



BOOK NOTICES. 



Bulletin of the United States National Museum, No. 22. Guide to the 

 Flora of Washington and vicinity. By Lester F. Ward ; 8vo., pp. 264. 



This is the twenty-sixth of a series of papers intended to illustrate the 

 collections of natural history and ethnology belonging to the United States 

 and constituting the National Museum at ^^'ashington. In the introductory 

 remarks which precede the list proper, the author gives a great deal of 

 useful general information relating to the Flora of Washington and vicinity. 

 In the list the common as well as botanical names of the plants are given, 

 with dates of flowering and localities for the rarer species. This general 

 list is followed by a check list, including 1,384 species. The report closes 

 with an instructive appendix in which many useful suggestions are given 

 to beginners in the study of botany. 



Proceedings of the American Society of Microscopists ; 6th meeting held 

 in Chicago, August, 1883; 8^'^., pp. 275. 



We have been favored by the Secretary, Dr. Kellicott, of Buffalo, with 

 a copy of the above work, which contains a number of very interesting 

 papers on natural history and other subjects. So energetic an organization 

 as the American Society of Microscopists cannot fail to greatly stimulate 

 microscopic research in all directions in this country. The volume 

 referred to gives abundant evidence of the good work being accomplished, 



The Number of Segments in the Head of Winged Insects. By Dr. A. 

 S. Packard. 



We are indebted to the author for a copy of this paper, recently pub- 

 lished in the American Naturalist. 



