570 VICTOR E. SHELFORD 
The succession of plants does not end here, and we find shrubs 
coming in and the turf migrating farther and farther up the slope 
of the pond margin. Shrubs shade the pond margin. The pines 
on the ridges are displaced by oaks and the undergrowth of her- 
baceous plants becomes denser; the pond margins are densely 
covered with turf or shaded by shrubs and trees. Though the 
higher portions of the ridges, namely, the feeding grounds, are still 
bare, C. tranquebarica is not to be found. The species must then 
have some vital relations to the pond margin. 
Fig. 13 The upper part of the burrow of C. tranquebarica, pupal cell shown by 
dotted line. One-third natural size. 
3. LHeological relations of the larvae. a. Local distribution. 
The general behavior of the larvae is similar to that of C. limbalis 
The holes are, however, deeper and straight: (fig. 13). The larvae 
of C. tranquebarica are found in clay, alluvium, or sand, and have 
been reared or identified from all of the kinds of soil mentioned 
in the discussion of the adults. In our sandy area of special 
study, they are found near the pond margins only. In all the 
localities referred to in connection with the adults, the larvae have 
