Il6 HEMIPtERA-HETEROPTERA. 



The injuries done by this insect are small in com- 

 parison with those done by C. septcndicim. It ap- 

 pears, in the perfect state, later in the season than the 

 seventeen year species. The popular name is indica- 

 tive of the time it appears. (2, 217). 



Sub-Order HETEROPTERA. 



Char. Hemiptera having the anterior wings thick- 

 ened at the base, with thinner extremities which over- 

 lap on the back. 



Mouth-parts inserted at the anterior and inferior 

 portion of the head. 



In this sub-order there are many wingless, parasitic forms ; there are 

 also many aquatic species. 



The form of the mouth-parts is typically the same as in the Ilomoptera, 

 but the position of these organs is different, as indicated above. 



The character of the metamorphosis, which these insects undergo, is 

 similar to that of the Ilomoptera. 



Most of the terrestrial species emit, when handled, a disgusting odor. 

 The taste of these insects is equally disgusting, as all can testify who have 

 accidentally put them in their mouths with berries or other fruit. 



Representatives of two of the families will be described. 



CORISI/E. 



Only two species of this very extensive family can 

 be described in this course : — 



The Chinch-bug, Rhyparoclirouius leucoptcrus Say. 

 — The form and appearance of this insect is too well 

 known in many parts of the country. Length of per- 

 fect insect 4 m. m. ; body narrow, black, with white 

 wings. 

 . Eggs deposited under ground. They are yellow 



