424 



Pupa. Length 11— 15 mm. Antennae reaching beginning of abdominal 

 segment 9, wing sheaths at beginning of segment 5. Labrum small, narrow, 

 with 6 short setae at anterior margin; anteclypeus with larger setae; 

 filtering is carried out by mandibles, the narrow, long, rodlike, distal ends of 

 which have a ventral position and are directed anteriorly; basal setae short. 



Midlegs natatorial, with sparse setae on tarsal segments 1—4; claws 

 represented by indistinct processes. 



Hooks of holding apparatus: 111:2—5; IV:2-5; V:2— 5 + 3— 7; VI:3— 5. 

 Lateral line in form of a row of dense brownish setae on segments 3—8, 

 opposite rows almost meeting ventrally on segment 8. 



Anal rods narrow, relatively long, slightly curved, covered with minute 

 spinules, posterior half of rod with 2 short, dark reddish brown setae; 2 

 setae at posterior end, median seta blunt, shorter than lateral. 



Number and arrangement of gills of the pupa of M. angustat; 



Segment 



Dorsal 



Pleural 



Ventral 



2 



4-3 



2 



3 



3 



4-3 



2-1 



3 



4 



4-2 



2-1 



3-2 



5 



3-2 



1 



3-2 



6 



3-2 



1 



3-2 



7 



3-2 



1 (0) 



3-2 



8 



3-1 





1(0) 



Number and arrangement of gills ofM. albicans 



Segment 



Dorsal 



Pleural 



Ventral 



1 



3 







2 



4 



2 



3 



3 



4 



2 



3 



4 



4 



2 



3 



5 



3 



2 



3 



6 



3(2) 



2(1) 



3 



7 



2 



1 



2 



8 



2(1.0) 







531 



