TABLE 1 





Stage 



Setae 



1st 



2nd 



3 id 



4th 



5th 





1 

 

 4 



2 

 

 4 



5 



1-2 

 7 



6 



3-4 



7 



5-7 



4-7 



7 







There are no tracheal gills in the 1st stage; they appear in the 2nd stage; 

 the number of gill filaments increases on both sides. 



The anterior -angle setae are absent on the 1st abdominal segment in the 

 1st stage and the medioanal setae are shorter than on the metathorax; 

 the anterior angle and median anal setae on abdominal segments 2—3 are 

 relatively longer than the thoracic setae, they are longer than the width of 

 the segment (Figure 194). The basoventral hook of the dorsolateral 

 sclerite of the anal legs (Figure 195) of the young larva is slightly curved 

 and bears a strong and long spinelike seta in the middle; there are no 

 sclerites with setae at the base of the hook in the 1st stage; the sword- 

 shaped process is absent in the 1st stage and appears in the 2nd stage; this 

 process reaches the middle of the claw in the 3rd stage; it is still slightly 

 shorter in the 4th stage than in the 5th stage. The dorsal tubercle in the 

 distal part of sclerite "b" of the young larva is absent to the 4th stage; the 

 median and lateral seta of this part are present from the 1st stage (like 

 the distodorsal seta of the basal part), but their relative length in the young 

 larva is not the same as in the full-grown larva (Figure 195). The longest 

 seta of the 1st stage (twice as long as the width of the head) is the median 

 seta of the distal sclerite; however, it becomes shorter already after the 1st 

 stage ( Is of the width of the head) and continues to become shorter to /s of 

 the width of the head in the 5th stage; the length of the lateral seta of the 

 distal sclerite increases after the 1st molt to lz of the width of the head; 

 it increases during the following molts to /io of the width of the head; the 

 length of the distal seta of the basal part of the sclerite increases from /^ 

 of the width of the head in the 1st stage to /s of its width in the 5th stage.* 



Pupa. Length of male pupa 11.2—12.2 mm, of female pupa 12.4—15.5 mm. 

 Antennae reaching the 8th abdominal segment in male pupae and the 5th seg- 

 ment in female pupae; basal segment with a small median seta and two 

 slightly longer lateral setae. The 3 lateral setae of the anteclypeus are 

 situated close together; lateral seta directed laterally; the other two setae 

 are of almost the same length, longer than the setae of the labrum 

 (Figure 196). Labrum darker than the clypeus, 2.5 times as broad as long; 

 setae 5 in number, dark, long and directed upward. Mandibles (Figure 197) 

 brown, darker at the end; left mandible with 2 pointed teeth; right mandible 

 with 3 pointed teeth; blade and teeth (except the basal tooth) serrated; the 

 218 distodorsal of the 2 external setae is shorter and curved. 



The wing sheaths extend in male pupae to the 5th abdominal segment and 

 to the 4th abdominal segment in female pupae. Segments 1—4 of the midlegs 

 bear dense natatorial setae; the dorsal row consists of brownish black setae 

 to 0.5 mm long, the ventral row of lighter, shorter and thinner setae; 5th 

 tarsal segment with a short distodorsal process which is slightly sclerotized 

 at the apex on the midleg; pretasus with two sickle -shaped light brown claws 

 with a soft cylindrical process of the same length between them (Figure 135, A). 



* All measurements after Nielsen (1942:351). 



225 



