62if 



625 



Sclerite "b" of anal legs with long, black setae dorsally. 

 Case (Figure 624) 10—11 mm long, made of sand grains, curved, markedly 

 narrower posteriorly, rounded in cross section. 



Pupa. Length 7.0—7.2 mm. Antennae longer than body; basal segment 

 of antenna of male pupae long, wide, almost twice as long as head, with black 



hairs and scales visible through 

 sheath; basal segment of antenna of 

 female pupae thinner. Labrum as in 

 Crunoecia, short, wide; only 2 of 

 the 5 surface setae long, thick, hooked, 

 black. Mandibles short, with wide 

 basal segment, distal part with median 

 serration. 



Wing sheaths pointed, reaching to 

 segment 7. Spurs of forelegs shorter 

 and thicker, those of mid- and hind 

 legs longer and narrower, their 

 number: 2, 4, 4. Mid-tibia and tarsus 

 slightly thickened, with dense, long 

 setae. 

 3 69 Abdominal segment 1 with a ridge 



at posterior margin, as in Crunoe- 

 cia, with 2 round, hard, spinulose, 

 lateral processes directed posteriorly. 

 Presegmental plates of holding 

 apparatus on segments .3— 7, each with 

 3 hooks; postsegmental plates of 

 segment 5 larger, with 6 hooks. Lateral line thin, setae grayish, distinct on 

 segments 4— 8, forming an open circle on segm.ent 8. Gills single, moderately 

 long on segments 2—6, arrangement as in larva. 



Anal appendages triangular-lobe-shaped, flat, with numerous black setae 

 laterally and at end, 4 distal seta longer and thicker than others. Genital 

 appendages of male pupae long, lobe-shaped, narrower distally, curved inward; 

 penis sheath short, bilobed. 



Pupal case 10—11 mm long, made of sand grains, conical, curved, with 

 anterior and posterior sievelike membranes (Figure 62 6); anterior end 

 covered by a small stone; case attached to a stone, a plant, or another case 

 by short ligaments with terminal disks; pupal cases sometimes in clusters. 

 Mode of life and habitats. Brooks and small rivulets. 

 Distribution. Western part of the European USSR. In addition, 

 Europe. 



FIGURES 623-626. Lasiocephala basalis Kol. 



623 - right mandible, median side; 624 - larval 

 case. Pupa: 625 — anal lobes; 626 - membrane 

 at posterior end of case (625 — after Thienemann, 

 the others after Klapalek). 



V. Family BRACHYCENTRIDAE Ulmer 



Full-grown larva. Length 6—14 mm. Body slightly narrower posteriorly; 

 head slightly wider than long; dorsal surface flat, bordered in some species 

 by a horseshoe-shaped ridge; frontoclypeus long, wider anteriorly; antennae 

 situated about in middle between eye and anterior margin. Gula wide, gular 

 suture absent. 



461 



