

Primary seta of labrum (Figure 697) longer than others; setae 2, 4, and 

 6 feathered; the other 2 marginal setae thin and small; 3 dorsal pits. 

 Mandibles of simpler structure than in full-grown larva; outer side not 

 yet broadened, without borders; the 2 apical teeth of the 4 teeth of lower 

 blade of left mandible longer than the other 2; basal tooth of mandibles 

 (especially of right mandible) indistinct and small; outer setae feathered. 



Submentum trapezoidal, lobes hardly marked; primary setae situated 

 in basal part and not laterally; these setae, seta of cardo and both setae of 

 stipes feathered. 



Lateral and posterior margin of dorsal sclerites of thorax brown or 

 dark brown from the 1st stage; black posteromedian spots of meso- and 

 metathorax absent. 



Trochantin of propleuron blunt, conical, without basal horn-shaped process; 

 primary seta relatively long; setules long; pleural suture brown; seta of 

 epimeron situated near suture. 



Ratio of length of legs 90:100:119; legs almost the same form; setae of 

 legs not yet strongly differing in length; claw of forelegs slightly longer 

 496 than tarsus; its seta spinelike, short; 2 small blunt spinules further basally. 

 Three small spinules on claws of midlegs and hind legs, basal to the seta. 



Abdomen light; segments 8 and 9 without ventral sclerites. Sclerite 

 of section "b" of anal legs yellowish, without dark basal margin; median of 

 the 2 distodorsal setae longer than the outer seta; median fan-shaped tuft 

 of long setae absent. Seta 8 is the longest seta on the claw, much longer than 

 seta 7. 



Second stage. Length 3.0— 4.7 mm. Head slightly flattened; pattern of 

 frontoclypeus more distinct; teeth of mandibles almost as in the full-grown 

 larva. Black median spots appear on the posterior margin of the meso- and 

 metanotum. Claws of legs without spines near basal seta or with only 

 1 small spine. Sternite of prothorax incomplete, consisting of 2 lateral 

 sclerites. 



Isolated ventral gills appear in the lateral and median rows (Table 19, 

 after Siltala). 



Ventral sclerites of abdominal segments 8 and 9 present, 



TABLE 19 



Segment 



2nd stage 



3rd stage 



4th stage 



lateral 



median 



lateral 



median 



lateral 



median 



Mesothorax 

 Metathorax 



1 



2 



3 



4 



5 



6 



7 



1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 

 1 





 1 

 1 

 1 

 1 

 1 

 1 

 1 

 



3-4 

 2-3 

 2-3 

 2-4 

 2-4 

 2-3 

 2-3 

 1-2 

 1-2 





 2-3 

 2-3 

 2-4 

 2-3 



2 



2 

 1-2 







8-14 



6-8 



7-9 



8-10 



7-11 



6-10 



7-9 



3-5 



2-5 





 6-8 

 7-8 

 5-9 

 5-8 

 4-7 

 3-6 

 3-5 







566 



