Couplet 9

 

9a:  Body 1-5 mm long; fore tarsus with 5 distinct tarsomeres; eyes usually normally developed

Noteridae   p. 405

 

9b:  Body usually > 6 mm long, if smaller, then scutellum visible, or fore tarsus pseudotetramerous, or compound eyes absent or greatly reduced in size and indistinct

Dytiscidae  p. 405

 

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