The thoracic segments of 1st- stage larva, especially the prothorax, 

 taper posteriorly, this character disappears and the 4th- stage larva 

 resembles the full-grown larva in the form of the thorax. Of the 4 primary 

 surface setae of the pronotum, the pairs of lateral setae are half as long as 

 the 2 median setae, but this difference disappears in the later stages. The 

 3 primary anal setae on the meso- and metanotum are of the same length in 

 the 1st stage; the median seta becomes longer than the other two in the 

 later stages, as long as the anterior -margin seta and the angle seta. The 

 development of the secondary anterior- margin setae on the thoracic seg- 

 ments is shown in Table 4.* 



[329) 



TABLE 4 













Setae 



Stage 



1st 



2nd 



3rd 



4th 



5th 



Pronotum 



1 

 

 





 



1 

 

 



1 

 

 



1 

 2 

 





 



1 





 



1 





 



2 

 2 

 4 





 1 



1-2 

 1 

 1 



2 

 1 

 1 



2 



2 



5-6 



1-3 

 1-2 



5 

 2 

 1 



5 



1-2 



1 



2 



Yellow anterior- margin setae .... 

 Seta of the 3rd series, situated 

 slightly posterior to the 



2 

 9-11 



4-8 





2 



Me sonotum 



5 



Anterior-margin setae situated medial 



2 



Anterior -margin setae situated lateral 



1-2 



Metanotum 



5-6 



Anterior-margin setae situated medial 



1-2 



Anterior- margin setae situated lateral 



1-2 







The setae of the trochantin of the prothorax are relatively longer in the 

 early stages than in the full-grown larva; setae of pleuron of meso- and 

 metathorax shorter. 



The differences in length and form of forelegs and hind legs of the young 

 larva (especially in the 1st stage) is little marked in the 1st stage; the fore- 

 legs do not have a basal process on the femur or a distal process on the 

 tibia (Figure 406); the cuticular processes characteristic for the legs in 

 „ 2q the 5th stage are also absent in the 1st stage; the above characters gradually 

 appear during development; the form of the foreleg in the 4th stage becomes 

 more similar to that in the full-grown larva; claws of young larvae much 

 longer than tarsi; the basal seta appears in the 2nd stage (Siltala, 1907: 

 386-388). 



* Only the primary anterior- angle setae are included in the table. 



361 



