Upper blade of left mandible (Figure 290) with a small tooth in the distal 

 part; the bluntly serrate part of the lower blade with toothlike tubercles 

 at the base and at the end; distal end of upper blade of right mandible with 

 a small rounded tubercle; base of distal part of lower blade of right 

 mandible with one tooth; both outer setae of the mandibles transparent, 

 2 67 curved and situated close together; distodorsal seta longer and recumbent. 



Submentum large (Figure 291 ), its posterior margin broad, almost as 

 broad as the anterior margin of the pregula; anterior margin with rounded 

 anterior angles and a slightly asymmetrical, small apically rounded 

 process near the middle; seta small, situated near the anterior angle. 

 Cardo dark brown, the seta situated laterally, short and thin. Stipes 

 yellowish, the setae thin and light; basal seta longer than the others; distal 

 seta situated on a sclerite near the middle of the stipes. Seta of maxillary 

 palpiger situated on a membrane, light, very thin and almost reaching apex 

 of galea; second seta situated basally in the middle; it is small, strong and 

 situated on a sclerite; Mentum broad and short. Palps and distal part of 

 labium as in other species of Hy po r hy a c o ph i 1 a . 



268 



FIGURES 292 and 293. Rhyacophila lata Mart.: 



292 — dorsal sclerite and pleuron of prothorax, lateral; 293 - right foreleg, anterior. 



Pronotum (Figure 292) slightly oblong, chestnut brown; its posterior 

 part with a longitudinal row of large, indistinct lighter dots in the middle; 

 groups of similar dots in each half of the sclerite. Posterior margin of 

 sclerite black in the middle and laterally, unusually broad in the middle 

 of each half, brownish, with a large rounded, light posterior process; 

 268 posterior angles and posterior part of the lateral margin black; lateral 

 margin of the anterior part with narrow brown border. Light notch near 

 anterior angle between the anterior and lateral margins very small, 

 containing the primary anterior-angle seta and one of the secondary setae; 

 both setae long and dark brown; 2nd secondary seta short and light, 

 slightly curved; angle with 3 small light setae laterally; lateral margin 



287 



