SIALTD^. 



607 



ChauUodes pectinicornis Linn;, our most common species, is 

 yellowish ashen, with reddish pectinated antennae. In C. ser- 

 ricornis Say the antennae are serrate. In Corydalus, the largest 

 form known, the pro- 



ihorax is square but 



narrower than the head 



and the antennae are 



stout but filiform. The 



male of C. cornutus 



Linn. (Fig. 594, fe- 

 male ; fig. 595, male ; 



fig. 596, pupa; fig. 597, 



larva), has very long 



mandibles, about twice 



as long as the head, 



whence its specific 



name. According to 



the Editors of the 



" American Entomol- 

 ogist," the eggs of 



this insect (Fig. 598) 

 are "oval, about the 

 size of a radish seed, 

 and of a pale color, 



■with some dark mark- 

 ings. They are usu- 

 ally deposited in a 

 squarish mass upon 

 reeds or other aquatic 

 plants overhanging the 

 water." Hagen does 

 not " think that the 

 lateral filamentous ap- 

 pendages are connect- 

 ed with respiration ; 



■• . , , 1 i Fig. 504. 



the little sponges at ® 



the base of the filaments and a little behind them are the true 

 branchiiE." "The reason that the larva of Corydalus has both 

 branchise and spiracles is, that it lives, like Sialis, some weeks 

 out of the -water before its transformation." (Hagen.) 



