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FIGURE 217. Rhyacophila s ub o v a t a Mart . Head, dorsal (A) and ventral (B) 



Full-grown larva. Length 20.0— 20.5 mm. Light colored; ground color 

 of sclerites whitish yellow. The dark figure on the frontoclypeus covers 

 the posterior angle and bears several light dots. Dorsal and lateral stripes 

 little marked; they are replaced by longitudinal rows of dots on a grayish 

 brown background. No dark figure in the posterior part of the pronotum; 

 the dots along the median suture and in both halves of the sclerite distinct 

 on a slightly dark background. 



Mode of life and habitats. Brooks with cool water. 



Distribution. Not recorded from the USSR, but possibly occurring 

 in the west and southwest. Europe. 



8. Rhyacophila subovata Martynov 



Lepneva, 1959:655—661, Figures 1—4. 



Full-grown larva. Length 18— 20 mm. Head (Figure 217) relatively 

 broad, of a characteristic form, nearly square in dorsal view, with almost 

 22 7 parallel sides; eyes slightly projecting laterally. Main color of head and 

 body light yellow. Anterior part of frontoclypeus slightly dark, with 3 pairs 

 of large dots; tentorial pits brownish; large blackish brown spot in the 

 posterior part of the sclerite which is triangular in dark specimens, with 

 straight anterior margin; it is bean-shaped in light specimens, slightly 

 concave anteriorly and rounded posteriorly; this spot bears a curved, 

 transverse row of 4—5 dots, the two marginal dots larger than the others. 



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