and abdomen of freshly hatched larvae 10:16.5:21.5. The head of the 

 1st stage is slightly wider than long; prothorax as broad as the head; the 

 following thoracic and abdominal segments taper gradually posteriorly 

 (Figure 4 70); the relative width of meso- and metanotum and of the 

 abdominal segments becomes larger in the later stages and the form of 

 the larva changes. The setae on the body (except the setae of the anal legs) 

 are moderately long. The gradual development of the secondary setae on 

 the dorsum of the thorax is given in Table 7. 



TABLE 7 



Setae 



Stage 



1st 



2nd 



3rd 



4th 



5th 



Pronotum 



1 

 

 

 

 



1 

 

 

 



1 





 

 



1 

 2 

 

 

 1 



1 

 

 

 



1 

 

 

 



2 

 2 

 5 

 1 

 2 



2 

 1 

 2 

 



2 

 1 

 2 

 



2 

 2 

 8 

 2 

 3-5 



4 



2 (-3) 



2 







4 (-5) 

 K-2) 



2 







2 



Straight, dark, anterior- margin setae. . 

 Curved, yellow, anterior- margin setae 



2 



8-9 



2 





5-8 



Mesonotum 



5 





2 (-3) 

 2 

 2 



Meta notum 



5 



Lateral anterior- margin setae 



K-2) 



2 

 2-3 







The setae of the trochantin of the early stages are longer and thinner 

 than in the full-grown larva. The difference between the length of the 

 forelegs and the other legs of young larvae is not as large as in species 

 of Agraylea, Hydroptila and Oxyethira; basal seta of the claw 

 absent in the early stages, the ventrodistal, leaf- shaped seta of the tarsus 

 is already present in the 4th stage. 



As in other genera of Hydroptilidae, abdominal segments 1—8 bear 

 tergites covering only part of the dorsum; sclerite of abdominal segment 9 

 well developed. Setae of abdomen of young larvae moderately long; 

 anterior -angle and medioanal setae longer and thicker than the others; they 

 are situated on small processes in the 3rd and 4th stages; the processes 

 359 at the base of the angle setae gradually decrease in size posteriorly; they 

 are absent on segment 8. 



Section "b" of anal legs (Figure 471) long, twice as long as broad; inter- 

 mediate and lateral distal setae long and thick; median and ventral setae of 



397 



