tube rounded and slightly broader; tube narrowed like a jug anteriorly, 

 near place of attachment; a convex, round operculum in this narrow part; 

 this operculum consists of 1 layer of sand grains. Pupae are found in 

 large numbers, so closely situated together that the cases are deformed; 

 there may be slits in the case walls, but these slits are closed by the walls 

 of adjacent cases. 



FIGURE 29 







Ventral 



Segment 



Pleural 















lateral 



median 



2 



23 



15+12 



18+14 



3 



24 



13 



18+14 



4 



21 



13 



19+11 



5 



17 



14 



12+10 



6 



14 



15 



12+10 



7 



15 



14 



12+10 



8 



15 



15 



- 



Mode of life and habitats. Large rivers in the Far East 

 (Amur, Ussuri, Bikin), in the main river and in tributaries, on solid bottom 

 (Klyuchareva, 1952:364, 372-373). 



Distribution. Far East (Amur basin) in the USSR. In addition, 

 Northwest China. 



5. Genus Aethaloptera Brauer 



Full-grown larva. Head oblong, not flattened dorsally, without a ridge. 

 Submentum with straight anterior margin and rounded lateral margins. 

 Mandibles long; teeth displaced to apical margin; large basal teeth absent. 

 Mesonotum with a small, median spot at posterior margin; metanotum with 

 a small, median spot at posterior margin; metanotum without spot. Pro- 

 thoracic trochantin with a long spear-shaped process. 



Mode of life and habitats. Large rivers. The adults fly in 

 large numbers above the water in summer. 



Distribution. Amur and Maritime Territory, Eastern and Western 

 Siberia in the USSR. In addition, China, Sunda Islands, India, Africa. 



Aethaloptera rossica Martynov 



Lepneva, 1947:150—151, Figures 26—37. 



Full-grown larva. Length 17— 18 mm (Figure 762); abdomen of fixed 

 specimens whitish; sclerotized parts yellow or whitish yellow. Head 

 (Figure 763) without pattern; eyes small; frontoclypeus narrow, with small 



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