Primary ventral setae of fore femur forming 2 light yellowish spines, 

 the basal small, blunt, the apical situated in middle of femur, longer, sharp; 

 posterior seta situated subventrally between spines as in L. rhomb icus. 



Gills on segments 2—7; segment 8 usually without gills, in contrast to 

 L. pol itu s. 



Tergite of abdominal segment 9 pale, with lai-ge dots near anterior 

 margin; medioanal setae long, black, or blackish brown; anterior -angle 

 setae slightly shorter; seta between medioanal setae dark, moderately long, 

 displaced slightly to the right; intermediate seta and lateral seta thin, 

 brown, former slightly longer than latter; 3—4 short brown setae on surface 

 in middle. 



Number and arrangement of gills of L. ma rmo ra tus 



Segment 



Dorsal 



Pleural 



Ventral 



2 



3 



3- 



-2 





3 



3 







3 



3 



3 



3 

 3 



3 



3-2 



3 

 3 



4 



3 

 3-2 



2 



2-1 



3 

 3 



5 



3-2 



1- 



-0 





3-2 



2 







1(0) 



3-2 



6 



2 











3-2 



2 







1(0) 



3-2 



7 



2 

 1(0) 







2 

 1(0) 



Sclerite "b" of anal legs brown, with 3 black setae near distal margin, 

 medioanal seta larger than others; 2 dark setae of different length at 

 median margin; surface with 8—10 short to moderately long setae; ventral 

 seta thin, moderately long. Sclerite "c" with wide, black, lateral margin; 

 seta short, thin. Claw brown, dark reddish brown apically, with a large 

 dorsal denticle; setae as in L. politus. Case 20— 28 ram long, made of 

 large fragments of detritus. 



Pupa. Length 16— 20 mm. Antennae reaching segments 7—8. Labrum 

 and mandibles as in L. rhombicus. 



Wing sheaths reaching abdominal segment 5. Midlegs natatorial, with 

 setae on tarsal segments 1—4; hind tarsi with sparse setae on segment 1, 

 sometimes on segments 1—4. 



Gills on segments 2 — 7 or 2—8. Holding apparatus on segments 4—7; 

 segment 3 sometimes with small plates; number of hooks: IV: 2— 3; 

 V:2-3+7-9; Vl:2-3; VII:2-3. 



Anal rods 1.1 — 1.4 mm long; 1st of the 4 setae situated basally, the 2nd 

 basal to middle, the 3rd and 4th subapically. Sheath of male genitalia 

 forming 2 pairs of lobes of different size, lateral lobes longer and wider 

 than small median lobes of penis sheath (Figure 314). 



235 



