fore tibia: one between the lanceolate spines and one lateral to them 

 (Figure 418); spatulate process longer than in A g r ay 1 e a, with a crest 

 of spinules near the distal margin; the anterior distal seta forms a straight, 

 strong spine; posterior distal seta normally developed. 



Setae of abdominal segments 1—8 thin; the anterior -angle and medio- 

 anal seta are the longest setae. The small anterior-margin seta becomes 

 smaller toward the middle segments; it increases again in size from 

 segment 7 onward; anterior-angle seta almost of the same length on the 

 first 8 segments (1.5—1.3 times as long as width of head); medioanal seta 

 decreasing slightly in size toward the 5th segment (from 1.4 times as long 

 as width of head to 1.3 times as long as width of head); it then increases 

 slightly in length; lateral setae, especially on the middle segments, little 

 marked; medioventral seta of abdominal segments 1—3 dark, paler and 

 smaller on the following segments. 



FIGURES 419-421. Hydroptila fe mora li s Eat. (after Nielsen;: 



419 — claw of right anal leg, outer and slightly ventral view (A), inner view (B); 420 — 

 right anal leg of 4th-stage larva, outer view (Hydroptila sp.); 421 — case of 5th- stage 

 larva. 



Of the 4 setae of the dorsal sclerite of segment 9, the medioanal seta is 

 longer than the others; intermediate and lateral setae shorter than the angle 

 seta; anterior-margin seta curved, directed posteriorly; all setae of the 

 sclerite are black. The 3 distal setae of sclerite "b" of the anal legs are 

 dark and long (but not longer than the medioanal seta of the sclerite of 

 segment 9); lateral seta short; seta of sclerite "c" slightly longer and 

 darker than in Agraylea. Claw short and strong, curved (Figure 419), 

 with a broad transverse, membranous stripe and 3 dorsal denticles; seta 1 



369 



