Dorsal stripes straight, smoky brown, narrow anteriorly, broader posteriorly, 

 with numerous large blackish brown dots; the part near the bifurcation of 

 the suture with seta 17 is light; the pit behind the seta has a dark border. 

 Lateral stripes unusually broad, relatively long, with longitudinal rows of 

 large dark dots; space between the stripes completely light or with a narrow, 

 slightly dark cross stripe; the short, dark setae 15 and 16 are situated 

 behind each other on a light background. On the ventral side, on the sides of 

 the posterior part, are large dark spots which are fused near the occipital 

 foramen; these spots bear rows of dark dots. There is marked variation in 

 color; the space between the dorsal and lateral stripes is more or less 

 dark in dark specimens; the dark background of the ventral spots is pale in 

 light specimens; there are sometimes only groups of dots; however, the 

 dorsal stripes are not changed or are only narrower. 



FIGURE 218. Rhyacophila s ub o v a t a Mart. 

 Pronotum 



Pronotum (Figure 218) yellowish, with broad black posterior margin and 

 posterior part of the lateral margin; the processes of the posterior margin 

 are broad, projecting far posteriorly; they have a small reddish brown part 

 anteriorly; the anterior part of the lateral margin and the part between the 

 anterior angle, and the light notch of the anterior margin have a narrow 

 brownish margin. The smoky brown stripe along the suture is broader 

 anteriorly, and bears indistinct dots; a large dark dot lateral to the base 

 of the row. Both long anterior -angle setae are thick and black; 3rd seta 

 small; medial to the notch, at the margin, are several small thin setae and 

 a short thick dark seta; the medioanal seta and the intermediate seta, which 

 are situated on a dark spot, are shorter than the anterior-angle setae; they 

 are dark, thick, with a small seta near the base; both lateral setae are 

 situated close together; slightly inside to the anterior end of the black lateral 

 margin is a small seta further to the middle. 



The gills of the abdominal segments consist of a dorsal upwards-curved 

 branch and of a group of posteriorly-directed filaments at the apex of a 

 stalk on segments 1—5 (13—16—11 in number) and 7—4 in number on 



237 



