segments 6—8; segments 1—4 have an additional small ventral branch with 

 thin, short filaments; the filaments of the dorsal branch are long, especially 

 at the apex; some branches are indistinctly segmented, sometimes bifurcate; 

 the number of filaments is as follows: I : 23, II : 24, III : 23, IV : 18, V : 17, 

 VI : 17, VII : 15, VII : 11.* 



228, 



FIGURE 219. Rhyacophila subovata Mart. Segment 9 and anal 

 legs, lateral (A) and dorsal (B) 



The sclerite of segment 9 (Figure 219) is light yellow, with oblique, 

 indistinct brownish stripes in each half, or with a median dark spot 

 which tapers posteriorly; the dark anterior margin is broadly black 



The number of filaments varies between ± 1—3, as usual. 



238 



