REVIEWS. 



ECONOMIC ZOOLOGY. 



Insects Injurious to Staple Crops. By B- Dwight Sanderson, 

 B.S. Agr. Pp. X. + 295. 162 figures. New York : Willey 6^ Sons, 

 1902. Price $1.50. 



Naturalists and farmers in these countries have much to learn from 

 their American colleagues about injurious insects, and in the handy little 

 volume now before us, the latest results of transatlantic economic prac- 

 tice are clearly and concisely summarised. The author introduces his 

 subject by giving an outline of the amount of injury caused to various 

 crops by insects, reduced to money values. This should surely tempt 

 all severely "practical" person to look into the brief account of insect 

 structure and development given in chapter 2. Then after an account of 

 the general farm methods against insects, and a survey of the groups of 

 insects beneficial to the farmer and worthy of protection and encourage- 

 ment, follows the detailed account of the common North American 

 injurious species grouped under the crops that they injure. The Irish 

 cultivator may not be specially interested in " Chinch-Bugs," or in 

 " Cotton-boll Weevils," but the accounts of Wireworms, and " Cut- 

 worms " — that is, Owl-moth caterpillars — will be useful to readers on 

 this side of the ocean, for though the species of these insects commonly 

 occurring in North Ameiica are diiferent from ours, they are nearly 

 related to our destructive kinds and similar in habits. 



The illustrations are on the whole excellent, many being taken from 

 the fine figures of the United States Department of Agriculture. Like 

 many American workers, Mr. Sanderson largely uses photographs from 

 actual specimens, reproduced by means of half-tone blocks. These are 

 very unequal in merit. The "Army-worms at work on Corn-plant" 

 shows how splendidly this method of illustration can succeed, the 

 " Mouth-parts of Grasshopper " how completely it can fail to give any 

 clear idea to the uninstructed reader of the objects supposed to be re- 

 presented. 



G. H. C 



Cartenfeinde und Cartenfreunde, von Prof. H. Koi^be. Pp. 

 320. 76 figs. Berlin : Karl Siegismund, 1901. Preis Mk. 3.60. 



From the east as well as from the west comes to us instruction on this 

 most important subject, and most of the animals described by Prof, 

 Kolbe are also our " Garden foes and friends." Here we have first of all 

 an account of the structure, life-history, and classification of insects, then a 

 sketch of the various means for destroying them, and then an account of 

 the injurious species, grouped under the various trees and herbs that 



