TABLE 27 







Denticles 







Segment 























large 







small 





3 



3-4 







3-4 





4 



4-5 







5-6 





5 



4-5 







5-6 





6 



4-6 







8-10 





7 



3-5 







8-10 





8 



4 







6-8 





Postsegmental plates of segment 3 thin, narrow, with transverse rows 

 of small spinules covering almost the whole width of each half segment 

 (Figure 743, B). 



Segment 9 with' parallel sides; 18—20 thin, grayish setae laterally near the 

 base. Anal rods convex laterally, narrower and hooked posteriorly; outer 

 and ventral side with dense straight, strong, golden brown setae hooked at 

 the end. Sheath of genital appendages of male pupae straight, oblique; penis 

 sheath short (Figure 744). 



Pupal case of varying form depending on conditions of pupation; when 

 larva pupates alone (rarely), the case forms a slightly curved tube attached 

 to substrate with margin of anterior end; this is closed inside by a convex 

 operculum with holes; posterior end of tube rounded, with small holes; 

 when tube is attached to an object, especially the tube of another pupa, no 

 wall is built at area of contact, and a larger or smaller ventral slit is left; 

 in this case, anterior and posterior end of slit always situated a distance 

 from the anterior and posterior margin of the tube, so that pupal case is 

 always tubular anteriorly and posteriorly. 



Mode of life and habitats. Larvae build capturing nets; live 

 in large (Amur) and small rivers, on solid bottom, mainly on stony bottom. 

 Widely distributed in the Amur and its tributaries (Ussuri, Bikin, Khor); 

 they occur in the Yenisei from the Minusinsk channel to the Stony Tunguzka; 

 also in the Angara and Lower Tunguzka; they are known from the lower 

 Biya and upper Ob in Southern Siberia. 



Distribution. Eastern and Western Siberia, Amur territory, 

 Maritime Territory in the USSR. In addition, Northeast China (Manchuria), 

 Japan. 



529 4. Genus Amphipsyche McLachlan 



Full-grown larva. Length 10—11 mm. Head flattened dorsally in 

 anterior part, with a horseshoe -shaped ridge which does not bear secondary 

 setae; anteclypeus with short, transverse sclerites; submentum triangular; 

 process of prothoracic trochantin conical. Brush of hairlike setae on tibiae 

 and tarsi of forelegs present but less dense than in Macronema. Anal 

 legs short. 



Mode of life and habitats. Rivers. 



Distribution. Amur basin in the USSR. In addition, China, Malacca 

 [Malaya], India, Sunda Islands, Africa. 



5724 



604 



