558 Animal Biology 



they attack man. Are they to be considered man's friend or enemy? 

 The leaf bugs consume large quantities of plant foliage and flowers. 

 The giant water bugs are enemies of small fishes, tadpoles, and other 

 insects. The harlequin cabbage bug is a serious pest of various garden 

 plants, such as cabbage, Brussels sprouts, and others. 



Fig. 287. — Chinch bug {Blissus leucopterus) of the order Hemiptera. Adult of 

 long-winged form, much enlarged. (From VVebster: The Chinch Bug, U. S. 

 Department of Agriculture; courtesy of Department of Entomology and Plant 

 Quarantine.) 



Fig. 288. — Mature bedbug (Cimex lectularius) of the order Hemiptera, much 

 enlarged. (From Back: Bedbugs, U. S. Department of Agriculture; courtesy of 

 Department of Entomology and Plant Quarantine.) 



Order 13 — Homoptera: Cochineal and crimson lake dyes or pigments 

 are made from the bodies of certain scale insects found particularly on 

 cactus plants. Shellac is a secretion from the glands on the backs of 

 certain scale insects found particularly in India (Fig. 289). Such scale 

 insects as the San Jose scale (Fig. 290), oyster shell scale, cottony 

 cushion scale^ and many others attack a great variety of plants, thus 



