and posteriorly; median pit asymmetrical. Seta 5 yellowish, straight, 

 relatively long; all other setae indistinguishable among the numerous 

 covering setae on the dark anterior -median part of the sclerite. Hairs of 

 anterior-angle penicillus finely pectinate at the end. 



FIGURE 678. Hydropsyche ornatulaMcL. Head, dorsal 

 (A) and ventral (B). Secondary setae not all shown 



Mandibles (Figure 68l) without transverse suture, reddish brown apically. 

 Left mandible with 2 apical teeth; lower blade with 4 teeth, 3 of which are 

 long and situated in the apical part and 1 broad, rounded and situated further 

 482 basally; a median brush near the latter tooth. Right mandible with a 



characteristic ledge and a bend at the base of the apical part; apical part 

 with 2 teeth at the end; lower blade with 2 large teeth and a small tooth 

 between them; a large, rounded tooth characteristic for the Hydropsychinae 



549 



