(252) 



FIGURE 440. Potamophylax stellatuj Curt. Larva and case 



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Dorsal and lateral stripes absent, replaced by rows and groups of dots; 

 a dark stripe between eye and anterior margin. Ventral side with large 

 groups of dots on lighter background near occipital foramen; 3 dots in each 

 half, one of them dark and large. Gula dark brown (Figure 441, B). 



Large setae dark reddish brown, less differing in thickness and length 

 than those in Limnophilus; small setae thinner and shorter. Median 

 anterior-margin setae moderately long, intermediate anterior-margin 

 seta markedly longer than median seta, lateral anterior-margin seta short, 

 light, curved inward; anterior frontal seta the same, middle, frontal seta 

 large, slightly shorter and thinner than seta 9, posterior frontal seta small, 

 thin. Seta 7 thin, strong; seta 9 thick, long; seta 11 minute, thin, light; 

 seta 10 the same; seta 12 short, thin; seta 13 shorter, but thicker than 12; 

 seta 14 not thicker, and only slightly longer than 9; seta 15 brown, thin; 

 seta 16 short, procumbent; seta 17 dark, strong, almost as long as middle 

 frontal seta. Ventral seta 8 small, strong; seta 18 very small. 



Labrum differing in form from that of Limnophilus, less wide, 

 with a shallow, rounded, median indentation; dorsal sclerite reddish brown, 

 median dot large, brown; posterior part slightly dark in middle; posterior- 

 angle sclerites blackish brown at end. Seta 1 in form of small, blunt, light 

 spine; seta 2 represented by small thick, blunt, curved spine; seta 4 by a 

 similar but straight, pointed spine; seta 3 short, light; setae 5 and 6 large, 

 dark. 



Mandibles black; left mandible with 2 teeth and a pointed process on 

 dorsal blade in addition to distal tooth, and a large tooth on ventral blade; 

 right mandible with 3 teeth dorsal to large, subventral tooth, and one tooth 

 ventral to it; chaetoids of brush longer basally; lateral setae brown, ventral 

 setae lighter and smaller. 



5725 



316 



