The Appendages of Nemoceran Larvae 33 



discerned on tlie ventral side of the appendage, a short 

 distance from its extremity. The anal feet are stiff, and 

 possess a very limited range of movement. De Geer 

 compared the long anal feet of the Tanypus-larva to 



wooden legs. 





Fig. 21. — Larva and pupa of Tanijpiis maculatus, together -with the egg-mass, 

 a developing egg in side view, tail-plates of pupa in front view, and the pro- 

 thoracic feet of the larva. (From Miall's Natural History of Aquatic Insects.) 



Nemoceran larvae are often footless, but pseudopods, or The ap- 

 provisional larval feet, occur in most of the families. The l^''^^^^ 

 larva sometimes creeps by means of thickened segmental ceran 

 rings, which may be armed with spines, and it is a i^'"^^®- 

 question whether the pseudopods are anything more than 



