18 THE CANADIAN ENTOMOLOGIST. 



which will flourish upon the Common White Clover ( TrifolUim repens), 

 although in a state of nature they may, according to the species, feed upon 

 plants belonging to a dozen different genera, all of which, however, will 

 be found to be of the same Natural Order as the clover (Leguminosce). 

 The Argyniiides, again, will all feed upon our common blue Violet ( V. 

 cuaillata), as will the Pierides upon common and easily procured cruci- 

 ferous plants. 



On the other hand, for a right understanding of the shapes and posi- 

 tions of flowers, and for a full appreciation of the beautiful methods by 

 which fertilization of the ovules is secured, a knowledge of the structure 

 and habits of insects is of inestimable value. 



There is, too, an economic aspect of this case, for if insects will sur- 

 vive upon plants which are only and perhaps distantly allied to their 

 natural food, it is obviously necessary that the cultivator should take this 

 into consideration when engaged in the constant strife which he has to 

 wage against injurious insects, and we even find that some species will 

 actually flourish better upon such cultivated plants, when grown in large 

 numbers ; the Colorado Potato Beetle may be instanced in this connec- 

 tion, which thrives so luxuriantly upon the cultivated potato, but which, 

 when confined to its natural food, the Solatmin rostratiifn, eked out but a 

 precarious existence. Otherwise it is useless to abstain from the cultiva- 

 tion of any crop which has been badly attacked, as a means of starving 

 out its insect enemies, in a locality where there are numerous wild plants 

 or weeds which are allied to the plant which it is desired to grow. This 

 must be borne in mind with regard to the many pests affecting cereals 

 which are able to find ample temporary lodgment in the various wild 

 grasses. J. Fletcher. 



NOTE. 



Living Pup/e.— The Rev. W. J Holland (5th Avenue, Oakland, Pitts- 

 burgh, Pa.) has a large number of living pupae of Telca Polyphemus, 

 Actias Luna, C. Promethea and Angularis, E. Imperialis and C. Regalis, 

 reared in the South, which he desires to dispose of at reasonable rates. 

 His object is to assist and encourage a poor lad whom he has interested 

 in Entomology. Application should be made to him at once. 



