FIELD BOOK OF PONDS AND STREAMS 



is yellowish. They frequent both lakes and streams and 

 range south through all of the Atlantic states. 



Fig. 1 74. — Small water stridor, Cents margmatus. 



Gerris marginatus. — This small water strider (Fig. 174) is 

 an abundant inhabitant of lakes and streams all over the 

 United States. Adults, one half inch long. 



Giant water-bugs, Family Belostomatidae. — The members of 

 this family are wide, flat-bodied insects which have front legs 

 fitted for clutching and the others flattened and oar-like. 

 They have a pair of short, strap-shaped breathing organs at 

 the end of the abdomen. 



Fig. 175. — Male water-bug, Bclostoma flumineum, 

 carr}dng eggs fastened upon him by the female. 



Water-bug, Belostoma flumineum. — This is one of the 

 smaller members of the family which has long been incorrectly 



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