Dorsal process of abdominal segment 1 not as large as in L. r h o m b i c u s, 

 with small, light spinules on saddle-shaped process at posterior margin. 

 Number of hooks of holding apparatus: 111:1-2; IV: 1-3; V: 1-2 + 4-7; 

 VI:l-2; VII:l-2. 



Anal rods strongly curved, with few spinules; 1st seta situated at basal 

 margin, 2nd seta in middle, 3rd and 4th setae apically and subapically. 

 Sheath of ventral appendages of male pupae wide, slightly longer than 

 narrow, bifid penis sheath. 



Anterior and posterior end of case covered with convex covers of sand 

 grains; case attached at anterior and posterior end to stalks or leaves of 

 plants, usually sedge leaves. 



Mode of life and habitats. Small, overgrown, stagnant water 

 bodies, small ponds, and spring puddles. 



Distribution. The European USSR, including the Crimea and 

 Caucasus; Western and Eastern Siberia, Yakutsk Region. In addition, 

 Europe, Asia Minor. 



17. Limnophilus elegans Curtis 



Dohler, 1914:30-35, Figures 1-4.- Lestage, 1921 :738, 747. 



Full-grown larva. Length 17— 18 mm. Head (Figure 391 ) relatively 

 wide; frontoclypeus reddish brown, with a small, light spot in posterior 

 angle; wedge-shaped pattern formed by large dots; area lateral to frontal 

 sutures also dark, with large light periocular spot; dots on area of dorsal 

 and lateral stripes large, on dark background, not very distinct. Ventral 

 side of head dark, lighter near occipital foramen, with groups of pale dots. 



Number and arrangement of 



gills of L.el 



egans 





Segment 



Dorsal 



Pleural 



Ventral 



2 



3 

 3 



3 



2-3 



3 

 3 



3 



3 

 3 



2-3 



2 



3 

 3 



4 



3 

 2-3 



1-2 





3 

 3 



5 



2 

 2 







2 

 3 



6 



1 

 1-2 







2 

 2 



7 



1 

 1 







2 

 2 



Pronotum reddish brown; groove in anterior third of sclerite darker 

 in middle; punctation more or less distinct. Mesonotum brown, anterior 



278 



