1920] 



Dozier: Insects of Florida 



333 



a depth of from six to ten feet. Clay or limestone underlies 

 the region studied, with outcroppings of limestone frequently 

 showing on the surface. Where the action of water has dis- 

 solved out the lime, numerous subterranean passages have been 

 formed. These cave in, forming the so-called "sinks." Sinks 

 often occur in long chains. In those sinks, which seldom go 

 dry, there is an accumulation of muck and peat on the bottom, 

 formed largely from the abundant aquatic vegetation. The 



Fig. 4. Map of the University of Florida vicinit}', showing the types of 



vegetation. 



surface is not infrequently entirely covered with duckweed 

 (Lemna). Not all of these depressions, however, contain 

 water, many being dry the year round. 



DESCRIPTION OF THE TERRITORY COVERED. 



The University of Florida occupies a tract of six hundred 

 and four acres, situated in the southwestern extremity of Gaines- 

 ville. Ninety acres of this tract are devoted to the campus, 

 drill grounds, and athletic fields. This was originally piney 

 woods and scattered over the campus are still to be seen 

 numbers of tall long-leaf pines. 



