LOW PRAIRIE 



279 



Eubranchipus serratus had disappeared and Diaptomus was not common. 

 Our next record is one month later, when the grasshoppers and other 

 prairie or land species had begun to appear. This succession is of 

 annual occurrence. The temporary pond community is seasonally 

 succeeded by the low prairie community. Flies which breed in water, 



Fig. 280. — A prairie pond, still permanent. 



Fig. 281. — A temporary prairie pond in spring. The short dead grass indicates 

 that a crop was harvested the preceding season. 



such as Scoliocentra (Fig. 282) and Tetanocera (Fig, 283), are common 

 (also Figs. 284, 285, 286). 



LOW PRAIRIE ASSOCIATION 



a) The subterranean- ground stratum (Stations 42, 43, 44, 45; Table 

 LXV). — Earthworms are abundant. Several of the grasshoppers de- 

 posit their eggs in the ground. The larvae of the click-beetle {Melanotus 



