HOW TO KNOW THE IMMATURE INSECTS 



IGa. The mouth parts, consisting of a segmented labium enclosing 

 needle-like mandibles and maxillae/ arise from the cephalic poi^ 

 tion of the ventral aspect oi the head capsule; in some aquatic 

 species the mouth parts appear to rise from the caudal portion 

 of the head capsule; among these the legs usually show some 

 kind of adaptation for aquatic locomotion and the prothoracic 

 legs may be modified for grasping. 



Fig. 69 Order HEMIPTERA page 129 



Together with the or- 

 der Homoptera there 

 are approximately 52,- 

 000 species recorded. 

 The Hemiptera are true 

 bugs. The great ma- 

 jority of the species 

 are phytophagous and 

 feed upon the juices of 

 living plants, causing 

 great losses to agri- 

 cultural crops, but 

 some are predacious 

 and also attack birds 

 and mammals, includ- 

 ing man. Most of them 

 are terrestrial and oth- 

 ers aquatic or semi- 

 aquatic. 



i^b. The mouth parts, consisting of a labium (may be absent) and 

 needle-like mandibles and maxillae, arise distinctly from the 

 caudal portion of the head capsule or from the meson between 

 the thoracic legs; no aquatic species. 

 Fig. 70 Order HOMOPTERA page 135 



Fig. 



69. a, Triphleps trietieolor (White) (Redrawn 

 from U.S.D.A.); b & c, Green stink bug, 

 Acrosternum hilore (Say). 



Fig. 70 a & b, Idiocerus provancheri Von D.; c. 

 Aphid; d, Aleyrodes sp., e, Magicicada septendecim 



(L. ); f & g, Two different instors of Stietocephala sp. 



(U.S.D.A, 33 



