Tergite of segment 9 (Figure 296) mainly yellowish, reddish brown near 

 anterior margin, with indistinct, dark, punctation; setae black or blackish 

 brown; medioanal seta and anterior-angle seta thick, long, former larger 

 than latter; lateral seta short, intermediate seta moderately long, both 

 thin; a thin, moderately long seta between medioanal setae; 13—14 short 

 and smo.ll, superficial secondary setae. 



Number and arrangement of gills of L.rhombicus 



Segment 



Dorsal 



Late 



ral 



Ventral 



2 



3 

 3 



3 



3 



3 

 3 



3 



3 

 3-2 



3 



2-3 



3 

 3 



4 



2-3 



2 



2 



2-1 



3-2 

 3-2 



5 



2-3 



2 



1(0) 



1-2 



2-3 

 2-3 



6 



2 

 2-1 



1(0) 



1(0) 



2 

 2-1 



7 



2 

 1(0) 



1(0) 





2-1 

 2-1 



8 



1(0) 







1(0) 



Sclerite "b" of anal legs light brown, dark brown laterally, with several, 

 large, dark dots, a narrow, reddish, distal stripe laterally and ventrally; setae 

 black; median and neighboring seta situated near distal margin, both thick, 

 long; lateral seta moderately long, thinner; a moderately long and a 

 smaller seta at median margin, both thin; 4—5 short, thick setae near basal 

 margin; 6—7 small setae on surface; ventral seta situated distally, short, 

 thick. 



Sclerite "c" yellowish, with broad, black lateral margin; basal seta 

 situated near the margin, small, reddish brown. 



Claw (Figure 297) yellowish brown, blackish at curvature, with a large, 

 dorsal denticle, dark reddish brown apically; dorsal setae dark brown; 

 seta 1 short, thick, slightly curved, situated basally; seta 2 thin, moderately 

 long, situated near dorsal margin; seta 3 also large, situated in middle 

 of distal part; seta 6 situated laterally near suture, short, thin; ventral 

 setae 7 and 8 short, light; lateral seta 5 small; median seta 4 slightly 

 larger, both light and situated laterally near seta 8. 



Larval case (Figure 298) made of detritus fragments, transversely 

 or obliquely arranged; if fragments are small, the case is relatively smooth, 

 slightly curved, narrower posteriorly, anterior opening obliquely truncate, 

 posterior opening covered by a membrane with a large, round hole; the 

 edge of some fragments projects above smooth surface. If fragments are 

 numerous, case has a characteristic appearance: particles are attached 

 only in the middle and project laterally; case of full-grown larvae may 



225 



