setae situated moi'e ventrally, anterior seta larger than posterior. Lateral 

 line from beginning of segment 3 to beginning of segment 8, thin; segment 8 

 with small, soft, lobed processes directed laterally and posteriorly. 



Gills single, dorsal and ventral, gills of segments 2—6 only post- 

 segmental, in conti^ast to Lepidostoma and Lasiocephala. 



Tergite of segment 9 indistinct, whitish; medioanal and anterior -angle 

 seta moderately long, dark; intermediate seta small, thin; lateral seta short, 

 thin. 



Area "b" of anal legs mainly membranous dorsally, with a narrow, light 

 brown, sclerotized stripe distally; lateral and distal parts yellowish brown; 



distodorsal setae black, long, the 

 largest about 1.3 times width of head. 



Number and arrangement of gills of 

 G.irrorata 



Sclerite "c" yellowish, with brown 



Segment 



Dorsal 



Ventral 



2 



1 



1 



3 



1 



1 



4 



1 



1 



5 



1 



1 



6 



1 



1 



lateral margin and a small, black seta. 

 Claw with a dorsal denticle; seta 1 

 situated on median side of basal part, 

 short, strong; seta 3 largest on the 

 claw, almost half as long as width of 

 head; setae 2 and 6 moderately long; 

 setae 7 and 8 yellow, thick; setae 5 

 and 4 light, thin, small, situated 

 laterally in basal part. 



Case 7—9 mm long, 2 mm wide, made 

 of plant particles in full-grown larva, 

 tetrahedral as in L. hirtum 

 (Figure 62 O), usually of particles of 

 roots or pieces of fallen leaves 

 arranged in a regularj circular pattern 

 on the cylindrical tube; detritus fragments less uniform and less closely 

 attached than in L. hirtum. Case uniformly wide, but tapering posteriorly; 

 dorsal margin of anterior opening with an additional or large plant fragment; 

 thus, cases made of sand or detritus have an oblique anterior opening, which 

 is directed downward; posterior end with a membrane with a small round 

 hole. Case of some full-grown larvae resembles that of 4th stage larva in 

 being tetrahedral, anterior part made of detritus, and posterior part of sand 

 grains (Figure 616); rarely does entire case consist of sand grains, usually 

 consists entirely of detritus before pupation. 



Young larva.* Stage 3. Length 1.7-2.4 mm; width of head 0.31-0.34 mm. 

 Head and pronotum without dots; tergites of meso- and metanotum pale, 

 indistinct. Legs pale yellowish. Abdomen tapering posteriorly; segment 6 

 without ventral gills; segment 8 without lateral processes. Case straight, 

 narrower posteriorly, round in cross section, made of sand grains, rarely 

 with irregularly arranged pieces of detritus. 



Stage 4. Length 2.7—4.3 mm. Sclerites lighter than in full-grown larva; 

 head light ventrally, with sparse dots, as on pronotum; tergites of meso- 

 and metanotum pale yellow. Fore trochanter, as in stage 3, without hairlike, 

 ventral chaetoids. Abdomen tapering posteriorly. Case straight, made of 

 sand grains, with obliquely truncate anterior end; posterior end closed by a 



After Nielsen (1942:405-479). 



458 



