14 WATER-BOATMEN. 
The Chinch-bug Family, FAMILY LYGAEIDAE. 
The Stilt-bugs, FAMILY BERYTIDAE. 
The Squash-bug Family, FAMILY COREIDAE. 
The Land-bugs with five-jointed antenne. 
The Stink-bug Family, FAMILY PENTATOMIDAE. 
The Burrower-bugs, FAMILY CYDNIDAE. 
The Negro-bugs, FAMILY CORIMELAENIDAE. 
, The Shield-backed Bugs, FAMILY SCUTELLERIDAE. 
FAMILY CORISIDAE. 
(Water-boatmen). 
The family Corisidz is the most aberrant family, being com- 
posed of insects whose mouth is flattened out, shortened, directed 
backward beneath, and the rostral sete thrust through a little 
Fic. 9.—Corisa interrupta Say. After Uhler. 
hole above the actual end of the clypeus, and not, as usual, placed 
at the tip. Instead of being let into the end of the prothorax, 
the head overlaps and fits intimately against it, and the fore- 
tarsi are flattened like the blade of a pen-knife, are set with 
bristles on the inner thin edge, similar to a comb, and end in a 
slender nail at the tip. “Uhler.” Corisa interrupta Say is 
shown in Fig. 9. All species of Corisa are oval, gray and 
black, mottled, usually less than half an inch in length. These 
insects are truly aquatic, but leave the water occasionally; they 
are attracted in large numbers to the electric light, and make it 
decidedly unpleasant to persons forced to work near it, for the 
bugs have the bad habit to be disagreeably inquisitive, and to 
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