160 



the appearance of that volume, are here treated of at considerable 

 length, e. </., the Hessian Fly, Stem Eel-worms, and the Wheat-bulb 

 Fly. In all cases much additional information is given ; but particu- 

 larly with regard to Wire-worms, Turnip-Flea and Hop Aphis. In the 

 treatment of insects injurious to fruit trees a most important addition 

 fs that of the use of the arsenical poisons. The use of these poisons, 

 now so well understood in this country, but which were until quite 

 recently unknown in England as insecticides, has been wisely and 

 boldly advocated by Miss Ormerod during the past two years, and the 

 results have been most satisfactory. 



As an appendix to the Manual is given a short and copiously illus- 

 trated '•' Introduction to Entomology," where, in the plainest possible 

 language, the structure and changes of insects are described, and illus- 

 trations and definitions of the various natural orders into which they 

 are classified are given, so as to " enable the observer of a crop attack 

 to tell at least what kind of insect is before him," and also " in the list 

 of the orders of insects, notes are given of the most observable of the 

 characteristic points by which the insects composing these different 

 orders mav be distinguished from each other." 



A glossary of terms and a full index render this work very com- 

 plete. It contains 410 pages, and is illustrated with 155 excellent 

 figures, many of them from the authoress's own pencil. It is well 

 printed, neatly bound in cloth, and the small price at which it is pub- 

 lished ($1.25) brings it within the reach of all. 



Revision of the Species of the Genus Agrotis. By John B. Smith, 

 8vo. Washington, pp. 237, 1890. 



This important work forms Bulletin No. 38 of the United States 

 National Museum. It was begun when Prof. Smith was associated 

 with Prof. Riley at Washington ; but was subsequently handed 

 over to the present author for completion, on account of pressure 

 of other work upon the time of the United States Entomologist. Prof. 

 Smith has made a special study of this difficult genus for many years 

 and the present monograph will be gladly welcomed by all students of 

 the noctuidse. There is no doubt but that the publication will give an 

 impetus to the itudy of these injurious insects, which was seriously 



