482 



ARTHROPODA. 



Sub Order I. PLANIPENNIA. Biting mouth parts. SIALID.E, wings 

 well developed, mouth not rostrate, larvae aquatic, commonly called dob- 



Fia. 511. Corydalis cornutus,* hellgrammite, male. (From Riley.) 



FIG. 512,Phryganea grandis. (From Schmarda.) 



sous. Corydalis,* hellgrammite ; Stalls* HEMEROBIID^, lace wings ; 

 wings well developed, mouth not rostrate ; larvae with sucking mouth 



