Femur of midlegs and hind legs with short, light, thin setae dorsally and 

 subdorsally; primary apicodorsal seta brownish, long, thin; basodorsal seta 

 in the form of a small, light spine. Primary anterior seta of femur spinelike, 

 dark; posterior primary seta moderately long, situated subventrally; 

 anterior surface with short, thin setae; a row of palmate and feathered chetae 

 subventrally; the whole subventral region of posterior surface and ventral 

 stripe of segment bear a brush of strong, spinelike setae with long, light, thin 

 ends; setae on ventral side of midlegs and 1 seta on ventral side of hind legs 

 very long. 



514 Tibia dorsally with small, sparse setae and 3 thin, long setae; distodorsal 

 seta brownish, long; a similar long, yellow seta further basally. Posterior 

 and anterior surface with thin, short, sparse, light setae, with spinelike setae 

 subventrally and more abundant on posterior part of hind legs; primary, 

 anterior, distal seta dark, short and blunt; posterior primary seta long, 

 situated subventrally; ventral setae form 2 rows of spines; 2 primary setae 

 situated distally, longer than the others; a light spinule between them, near 

 the margin; feathered setae among secondary setae of comb. 



Mid-tarsus and hind tarsus with a long brownish distodorsal seta; a shorter 

 light seta nearby, anteriorly; surface with sparse, minute setae anteriorly; 

 2 larger setae among them on hind legs; a feathered seta situated further 

 distally; 2 rows of strong spines on ventral side, including 2 primary setae. 



Claw dark, blunt, strongly curved; instead of the light, thin seta on the 

 forelegs, there is a short, massive, blunt spine. 



Abdomen light, yellowish; covering setae brownish; small, blunt setae on 

 ventral side sparser than on dorsal side; blunt, covering chetae 



515 characteristic for Hydropsyche are absent in Cheumatopsyche. 

 Primary setae thin, brownish, darker and stronger posteriorly. 



Gill filaments fewer than in Hydropsyche; number given in Table 23. 



TABLE 23 









Ventral 





Segment 



Pleural 



















lateral 



intermediate 



median 



Meso thorax 



8-10 









Metathorax 



8 



- 



- 



8-9 



1 



- 



- 



8+5 



- 



2 



- 



8+8 



- 



7 



3 



1-2 



6+6-7 



- 



5 



4 



1-2 



7+8 



- 



6-5 



5 



1-2 



7+6 



- 



4 



6 



1-2 



5+4-7 



- 



4 



7 



- 



5+3 



- 



— 



Gills on pleural region of abdomen little marked; they consist of 1 or 

 2 short filaments near posterior margin on segments 3—6. 



Small, dorsolateral sclerites of segment 9 with 4 dark setae near 

 posterior margin; median seta larger than others. Small, lateral sclerite 

 of segment 9 with several minute setae and 1 larger dark seta. 



588 



