♦ ♦2 b 



♦ «2A 



FIGURES 441-443. P o t a m o ph y 1 a x st e 1 1 a t ii s Curt.; 



441— head, dorsal (A) and ventral (B); 442 — pronotum ( A), mesonotum (B); 443 — pro- 

 thoracic horn and sternite. 



Sclerites of cardo transverse, slightly narrower laterally; median 

 margin and transverse stripe black, the latter situated at anterior margin; 

 both setae thin, small. Lateral sclerites of mentum triangular; median 

 sclerites small, not dot-shaped as in Limnophilus, but transverse and 

 almost fused with lateral sclerites; seta dark brown, large, situated near 

 distal margin. Stipes brown, with reddish brown median margin pos- 

 teriorly; lateral seta brown, large; distal seta small, thin, short. Palpifer 

 blackish laterally; apical seta thin, dark; basal median seta small, light; 

 galea cylindrical, rounded apically; palp very short, its 3 proximal segments 

 about the same length, last segment smaller. Mentum in form of a narrow, 

 dark semicircle with a blackish, transverse stripe in middle; ventral 

 sclerites with a minute, light seta; palpifer inform of wide horseshoe- shaped 

 palps slightly longer than wide rounded end of labium. 



Pronotum (Figure 442, A) yellowish in middle, brownish laterally in 

 anterior part and at posterior margin; groove in anterior third golden 

 brown in middle; anterior margin brownish; posterior margin brown; 

 transverse stripes black, separated; lateral margin wide; a group of pinkish 

 dots near base of posterior -angle process; large setae brownish black. 



317 



