forms of aquatic insects in their immature stages. 41 



are printed in italics. 



are not remarkably different from the adults. The wings develop externally 



of the same species, being more or less wormlike, having wings developed 

 mentary, or even wanting {larvae proper). 



Rear End of Body 



a pair of fleshy pro- 

 legs with numerous 

 claws on them 



do., with paired larger 



hooks at tip 

 a long tapering tail 



paired hooked claws 



variable 



see next table 



Other Peculiarities 



mostly living in port- 

 able cases 



head small, often ap- 

 parently wanting 



Habitat 



all waters 

 gravelly beds 

 all waters 



slow or stagnant waters 

 all waters 



Food Habits 



herbivorous 



mostly herbivorous 



carnivorous 



carnivorous 



carnivorous 

 see next table 



guished from aquatic larvae of other groups by the absence of true legs. 



