3 anterior marginal setae are small and light. The sclerite has a broad, 

 dark brown margin along the frontal sutures which continues as a narrow 

 stripe along the coronal suture (Figure 254); the lateral stripe of the head 

 is curved, narrow, adjacent to the dorsal stripe near the base of the coronal 

 suture; there is a large light spot between the stripes in the posterior part 

 of the head; this spot is connected anteriorly in the area of seta 15. The 

 head is light anteriorly and the eyes are situated on a white area; seta 9 is 

 the longest seta of the head and is situated medial to the eyes; the small 

 light seta 11 stands nearby; seta 7 is dark, shorter than seta 9; seta 10 is 

 situated lateral to the eye; it is transparent and light; setae 14 and 12 are 

 situated behind the eye; they are brown and strong; seta 15 short, brown 

 and strong; seta 16 shorter; setae 17 small, thin, light, situated laterally at 

 the level of the bifurcation of the frontal sutures. Head yellowish red 

 ventrally, with indistinct light dots in the posterior part; gula brown and 

 small (Figure 255); setae 8 spinelike; setae 18 small; occipital foramen 

 with a narrow dark border. 



[251) 



FIGURES 254 and 255. Rhyacophila retracta Mart.: 



254 — head and mandibles, dorsal; 255 — gula, pregula, submentum 

 and sclerites of cardo. 



266 



