INJURIOUS INSECTS OF KANSAS. 



other hand, have the mouth-parts more 

 or less completely combined into a hollow, 

 pointed beak, which may be thrust through 

 protecting outer envelopes to get at the 

 juices of plants and even animals. The 

 sucking insects live on liquid food. The 

 true bugs, including such well-known 

 forms as the Chinch-bug, Squash-bug, and 

 the plant-lice, are insects possessing typ- 

 ical sucking beaks. 



This broad distinction between biting 

 and sucking insects is an attractive one, 

 but, unfortunately for its immediate use 

 as a basis for generalizations concerning practical work, compli- 

 cations arise because of the wonderful character of the growth of 

 certain insects. While the young of the Chinch-bug much re- 

 semble the parent, having a true sucking beak, and lacking only 

 the wings which are present in the adult, the young of the but- 

 terfly or of the moth do not at all resemble the parent forms, and, 

 correlated with the difference in resemblance, have wholly diflfer- 

 ent habits. The adult Tomato-worm Moth, for example, has a 



Fig. 2. Squash-bug, ■with 

 sticking moutii-parts. 



Fig. 3. Tomato worm. 



long, slender tube, which serves for sucking up honey from the 

 deep nectaries of flowers ; the young of this moth is the greats 

 disgusting, green " worm," or, more properly, caterpillar, which is 

 furnished with a pair of strong, biting jaws. Thus we have an 

 insect which, in one stage of its life, is a biting insect, and, in an- 

 other stage, is a sucking insect. 



This difference between the different stages of insect lifs tends 

 to make the study of insects, as taken up by the economic ento- 

 mologist, more difficult than at first sight it might appear to be. 

 When we speak of biting insects, we must include in our minds 

 not only those insects which, as adults, are biting, but we must 



