the prothorax of some Integripalpia (Limnophilinae) bears a small 

 medial sternite with small plates or rows of dots at the sides; similar 

 (sometimes indistinct) dots are present on the ventral side of the meso- 

 and metathorax. 



Legs.* Caddis fly larvae living on the bottom of water bodies have 

 legs of the walking type. The forelegs are adapted for catching the prey or 

 for other functions connected with the collection of food or the construction 

 of the case, and are usually shorter than the mid- and hind legs. The hind 

 legs are sometimes especially long. The hind legs are natatorial in some 

 species of Leptoceridae (Triaenodes). In the same family and some other 

 families (species of Beraea, Sericostoma) the long hind legs have a 

 tactile function, as they are first extended from the case when the larva 

 emerges from it. In larvae with a heavy mineral case (Molannidae) which 

 move forward in leaps, the short forelegs have a supporting function when 

 the larva rests on the substrate during leaps. 



The legs (Figure 10) consist of six segments: coxa, trochanter, femur, 

 tibia, tarsus and pretarsus. 



[23: 



FIGURE 10. Legs of Rhyacophila nubila: 



foreleg, anterior (A), posterior (B); hind leg, anterior (C), posterior (D). 



Snodgrass (1935:193) suggested a method of orientation of the leg for descriptions. The leg is considered 

 extended at a right angle to the body. In this position the preaxial part of the leg is the anterior part, 

 the postaxial the posterior part, the outer surface is the dorsal and the inner the ventral surface. 



19 



