L41 



Prosternite in form of small, miedian sclerite, dark brown posteriorly, 

 with several fused brownish dots laterally. Mesosternite represented by 

 brown, sclerotized dots. 



Legs as in Figure 235; ratio of length of legs 75:100:96; coxae brownish 

 yellow, with blackish dorsal nnargin; other segments brown; hind coxae and 

 femur shorter than on midlegs, hind tibia and tarsus slightly longer. 

 Setae as in Figure 235; anterior distal surface seta of fore coxa bifid; 

 light, hairlike, ventral chaetoids in distal part of trochanter and near base 

 of femur of forelegs; midlegs with such chaetoids on trochanter only; hind 

 legs without chaetoids. Claws strongly curved in full-grown larva; basal 

 seta moderately long, thin apically (Figure 236, A); claw of 1st stage larva 

 slightly curved, with small, spine-shaped seta (Figure 23 6, B). 



Abdominal segment 1 with high, pointed, dorsal process (Figure 228); 

 lateral processes wide, low, without sclerite; ventral side of segment 

 convex, padlike. Ventral elliptical areas on segments 2—8. 



Lateral line from segment 2—7, with fine hairs. 



Gills with a single filament, on segments 2—6, pre- and postsegmental 

 on dorsal side, postsegmental only on ventral side. Gills absent in the 

 1st and 2nd stage larvae. 



Development of gills in the 3 last stages (after Nielsen) 





Segment 



3rd stage 



4th stage 



5th stage 



dorsal 



ventral 



dorsal 



ventral 



dorsal 



ventral 



2 



1 



1 



1 (0) 

 1 



1 





1 



3 



1 



1 



1(0) 



1 



1 





1 



4 







1 



1 





1 



5 









1 



1(0) 



1 



6 









1(0) 





1 



Tergite of segment 9 small, grayish, with 4—5 large, dark dots near 

 anterior margin; posterior margin indistinct in middle; 28—33 setae 

 (Nielsen, 1942:572). 



. Sclerite "b" of anal legs brownish, with 5—6 large, dots with dark outline 

 laterally at anterior margin; setae short, thick. Sclerite "c" yellowish, with 

 black dorsal margin. Claw (Figure 237) without dorsal denticle, dark 

 brown basally, brownish apically; setae 1 and 3 directed medially, the 

 former short, thin; seta 2 situated subdorsally lateral to the apex of 

 membranous bar; seta 6 situated more distally, shorter than 2; setae 7 

 and 5 situated basally on sclerite, seta 8 and small seta 4 situated basally 

 on membrane. 



Case (Figure 238) made of sand grains, slightly curved, narrower 

 posteriorly, flattened ventrally; the smallest grains at posterior end and 

 ventrally, largest grains laterally and near anterior end; these "lateral 



174 



