NEUROPTERA. 



177 



This species is common throughout the United States. 

 The larvae are called Dobsons by anglers and are used by 

 them for bait, especially for bass. Figure 216 represents a 

 full-grown Dobson, natural size. These larvae live under 

 stones in the beds of streams. They are most abundant where 

 the water flows swiftest. They are carnivorous, feeding V- -i- 

 upon the nymphs of Stone-flies, May-flies, and other insects. 







FIG. 2is.Corydalt. 



FIG. **(>. Cerydali 



When about two years and eleven months old, the larva leaves 

 the water, and makes a cell under a stone or some other 

 object on or near the bank of the stream. This occurs dur- 

 ing the early part of the summer ; here the larva changes to 

 a pupa. In about a month after the larva leaves the water 

 the adult insect appears. The eggs are then soon laid ; 





