
<p class="question">Does your specimen have 3 short, stiff pointed valves at the tip of the abdomen?</p>

<table width="570px">
  <tbody>
    <tr>
      <td>
        <a href="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_anax_procts.jpg" rel="lightbox"><img src="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_anax_procts_thumb.jpg"/></a>
      </td>
      <td>
        <a href="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_libellulidae_procts.jpg" rel="lightbox"><img src="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_libellulidae_procts_thumb.jpg"/></a>
      </td>
    </tr>
  </tbody>
</table>

<p class="question">Or does it have 3 long, caudal tracheal gills at the tip of the abdomen?</p>

<p><a href="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_caudal_gills.jpg" rel="lightbox"><img src="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_caudal_gills_thumb.jpg"/></a></p>

<p class="question">And a head like this?<p>

<p><a href="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_lestidae_prementum.jpg" rel="lightbox"><img src="http://parkcitizenscience.org/dragonfly/diagrams/diagram_images/key_lestidae_prementum_thumb.jpg"/></a></p>

