brown, strong; 7—8 small setae on surface. Sclerite "c" light brown, with 

 broad, reddish brown, lateral margin; seta small, brownish, strong. Claw 

 and its setae as in L. nigriceps. 



Case straight, slightly tapering posteriorly, 30— 37 mm long, made of 

 longitudinally arranged plant fragments, sometimes with 1—2 longer 

 fragments, sedge leaves or a lamella of reed stalks projecting posteriorly, 

 so that case is 50— 60 mm long. Case sometimes trihedral, as in 

 L. nigriceps, the ventral side fo rmed by 3—4 large, overlapping leaf 

 fragments, other walls converging dorsally; trihedral cases often consist 

 of pieces of thin, fresh leaves (Figure 34l). 



Number and arrangement oi 



gills of L. d 



ecipiens 





Segment 



Dorsal 



Pleural 



Ventral 



2 



3 

 3 



3-2 



3 



3 

 3 



3 



3 

 3-2 



3-2 



2 



3 

 3 



4 



3 

 3-2 



2 



2-1 



3 

 3-2 



5 



3-2 

 2 



2-1 



1 



3-2 

 3-2 



6 



2 

 2-1 



1(0) 



1(0) 



2 

 2-3 



7 



2-1 

 2-1 



1(0) 



1(0) 



2-1 

 2-1 



8 



2-1 







2-1 



Pupa. Length 15— 18 mm. Antennae reaching end of segment 8. Labrum 

 brownish dorsally; median seta 1 small, yellow; 5 dark brown, large, hooked 

 setae. Mandibles with wide distal part; median blade straight, serrated. 

 Wing sheaths reaching end of segment 4 or beginning of segment 5. Midlegs 

 natatorial. Segments 1 — 3 of hind tarsi with sparse setae. 



Dorsal process of abdominal segment 1 yellowish, its posterior saddle - 

 shaped process brown posteriorly, with small, dark reddish brown spinules. 

 Holding apparatus with pinkish plates, hooks small, dark brown; segment 3 

 usually without plates, sometimes with a small plate, on one side only, without 

 hooks or with 1—2 small hooks; number of hooks: 111:0—2; IV:2— 3; 

 V:3-4+ll-15; VI:3-4; VIl:2-4. Gills on abdominal segments 4-8. 



Ventral appendages of male genitalia wide, rounded posteriorly 

 (Figure 342), longer than penis sheath, which is narrow and bifid. Anal 

 rods (Figure 343) thin, straight, slightly curved at end; both basal setae 

 short, thin, situated one behind the other in middle, not quite symmetrical 

 on right and left rod; subapical and apical seta thick, black, curved, 

 moderately long, former larger than latter. 



Pupal case 20— 30 mm long, covered with plant fragments, its ends 

 covered with thin, membranes; case attached by ventral part of anterior 

 membrane to roots, stalks, or pieces of wood on the bottom. 



250 



