PHRYGANE^E. 155 



the name of callis, and consider them as an excellent bait. 

 When the larva is about to change its state, it rises with 

 its case to the surface, fastens that to some water-plant 

 by silken threads ; and after remaining for two or three 

 weeks in the state of a chrysalis, comes forth from its 

 case a perfect fly. The Phryganese are usually the 

 first flies upon the water, and on that account they get 

 their common name of spring flies. In the early part 

 of the season they appear only during the warm time 

 of the day, and in those gleams of clear sunshine which 

 brighten the variable weather of March and April ; 

 but as the season becomes warmer, they make their 

 appearance only in the morning and evening ; and at 

 the very hottest period of the season only during the 

 night. Thus their habits, as well as the structure of 

 their wings, have some resemblance to those of the 

 moths. Fish are exceedingly fond of those insects ; and 

 therefore when they are upon the waters, imitations of 

 them are the surest fishing-flies. 



