170 



INVERTEBKATE ANIMALS. 



that the bristles ■which terminate the aLdomen do not form a 

 " spring." The body is often covered with delicate scales, which 

 are shown under the microscope to be beautifully marked and 

 striated. 



Section II. Hemimetabolic Insects. — Metamorphosis incomplete; 

 the larva differing from the perfect insect chiejiy in the absence of 

 wings and in size; pupa usually active, or, if quiescent, capable of 

 movement. 



Order V. Hemipteba. 



In this order the mouth is formed for suction (fig. 109, C) ; the 

 eyes are compound, but simple eyes are often jiresent in addition. 

 Two pairs of wings are always present. 



Fig. 114. — Hemiptera. Bean KyiWia {Aphh fnhiv); winged male .and 

 wingless female. 



Fig. 116.— Hciiiiptcra. A, Fenlatoma ruHlails, with the wings closed. B, Elwi>hinasl,r 

 I'/K-arim/Hs, witli the wings expanded in flight : a Anterior wing (hemolytron), with 

 its basal portion hardened by cliitine ; b Posterior membranous wing. 



The Hemiptera live upon the juices of plants or animals, which 

 they are enabled to obtain by means of their suctorial mouths. All 



