setae lighter and thinner. Posterior distodorsal seta of tarsus, especially 

 of the hind legs, long, slightly shorter than on the tibiae; anterior seta much 

 shorter and thinner; ventral setae thin and shorter than on the tibiae. Claw 

 and its basal seta thinner than on the forelegs. 



FIGURE 296. Rhyacophila lata Mart. Right anal leg, outer view 



Anterior -angle and medioanal setae of abdominal segments 2—8 long, 

 chestnut brown as in other species of Hyporhyacophila, longer than 

 on me so- and metanotum and on abdominal segment 1, and longer than 

 the segment; anterior-angle seta of segments 1—6 situated near the middle 

 of the segment (as in other species of Hyporhyacophila); this seta is 

 displaced toward the anal setae on segments 7 and 8; setae of segment 8 

 darker, stronger and blackish brown; secondary anterior-angle setae and 

 intermediate and lateral setae thin, little marked; Rh. lata, in this respect, 

 differs from Rh. sibirica because the above setae are well marked; 

 anterior-margin setae of segments small; intermediate ventral seta 

 relatively large, dark; the other 2 ventral setae on segments 2—8 

 (on segment 1 all 3 ventral setae) are small. 



Dorsal sclerite of abdominal segment 9 golden brown, darker in the 

 middle, with indistinct margin; a short, blackish brown stripe in the middle 

 near the anterior margin and lateral to it small anterior -margin setae; 

 4 setae at the sides of the posterior margin; medioanal setae long, situated 

 close together; anterior -angle setae also long; however, they are shorter 

 than the medioanal setae of the preceding segments; lateral seta long; 

 intermediate seta small and thin. 



290 



