182 



WET GROUND COMMUNITIES 



139 



FIG. 138. Prairie-like stage of a pond margin. 

 Habitat of Cicindela tranquebarica in the pine 

 zone of the ridges at the south end of Lake 

 Michigan. The dark portion in the foreground 

 is the shadow of a tree. At the left is the 

 cattail zone of the depression; between a and 

 b, the sedge zone; between b and c the zone of 

 high-depression plants. The white blossoms 

 here are those of Parnassia caroliniana; their 

 distribution, September, 1906, corresponds ap- 

 proximately to the distribution of the larvae of 

 C. tranquebarica, which arose from eggs laid in 

 May and June, 1905. The portion to the right 

 and above c represents the higher portion of the 

 ridge and the habitat of C. scutellaris. Reprinted 

 from the Journal of Morphology. 



FIG. 139. The upper part of the burrow of 

 C. tranquebarica, pupal cell shown by dotted 

 line; \ natural size. Reprinted from the Journal 

 of Morphology. 



