posteriorly with 2 small yellowish setae. Posterior half of sclerite with 

 2 long brown setae and a seta of moderate length between them; a small, 

 light seta at the base of each of these three setae; 2 setae near the lateral 

 margin; posterior seta shorter. 



The strong anterior-angle and medioanal setae of meso- and metanotum 

 long and reddish brown; secondary anterior -angle seta small; intermediate 

 and lateral anal setae situated near the medioanal seta and little marked; 

 anterior -margin seta of the mesonotum large, slightly shorter than the 

 angle setae, dark and almost as long as the pronotum; anterior -margin 

 seta of metanotum very small. 



Pleuron of prothorax large (Figure 292); region of pleural suture 

 blackish brown; sclerite of epimeral region clearly marked, brown; seta 

 on the membrane near the sclerite small and light; episternal region 

 brown; groove on the sclerite deep in Rhyacophila s. str., it is complete 

 and well marked in R h. lata; trochantin with a large dark brown horn- 

 shaped process with a strong, reddish brown terminal seta; trochantin 

 laterally and subapically with 2 thin light setules on a membrane. Pleurites 

 of meso- and metathorax brown, in some places black, relatively broad; 

 seta of episternum dark brown, long and strong; epimeral seta small and 

 thin, situated on a membrane. 



(269) 



FIGURES 294 and 295. Rhyacophila lata Mart.: 



294 — mesopleuron, coxa, trochanter and base of femur of the right 

 midleg, dorsal; 295 - midleg: right leg, posterior (A), left leg an- 

 terior (B). 



288 



