Prosternite (Figure 369) brownish in middle, with pinkish brown groups 

 of dots laterally. Horn short, thin, grayish, with whitish apex. Mesothorax 



ventrally with 3—4 large pinkish 

 sclerotized dots on each side near 

 posterior margin; metathorax 

 with 3 lighter dots on each side. 



Primary ventral setae of 

 fore femur (Figure 370, A) forming 

 yellowish spines, basal spine small, 

 blunt, apical spine small, thin, 

 situated in middle of femur; 

 primary, posterior seta short, 

 brown, situated basal to spines. 

 Mid-femur (Figure 370, b) slightly 

 convex dorsally, slightly concave 

 ventrally; both primary, ventral 

 setae situated in basal part; apical 

 seta in form of large, thin spine; 

 basal seta short, dark, strong. 

 Primary ventral setae of hind 

 femur (Figure 370, C) situated close 

 together in middle of femur, dark, 

 strong, apical seta longer than 

 basal; posterior and distodorsal 

 setae also long. 

 Lateral line on segments 3 — 8; hairlike spinules grayish brown. Gills on 

 abdominal segments 2—7, 



Tergite of abdominal segment 9 slightly brownish, without punctation; 

 medioanal seta dark reddish brown, long; anterior -angle seta almost as 

 large, shorter than medioanal seta; intermediate seta strong, dark, 

 moderately long; lateral seta short, thin, light brown; between medioanal 

 setae, slightly to the left, a moderately long seta resembling intermediate 

 seta; to the right, a short, dark, strong seta; surface with 9—10 small 

 setae. 



FIGURES 3( 

 McL.: 



and 367. 



361 



Limnophilus extricatus 



366 — larva case; 367 — head, dorsal (A) and ventral 

 (B). 



Number and arrangement of gills of L. extricatus 



Segment 



Dorsal 



Pleural 



Ventral 





3 



2 





3 



2 













3 





2 



3 



3 



3 



3-2 





3 



3 





2-1 



3 



4 



3-2 



1 





2 









2 





2 







2 



5 









2 



6 



2-1 







2-1 









2 



7 



1(0) 







2-1 









1(0) 



264 



