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. 



