515 



Dorsal stripes absent or indistinct (brownish), with 2 large, dark dots and 2 

 indistinct, pale dots along posterior part of frontal suture; rows of 2 and 3 

 dots and one dot between them lateral to coronal suture; large dots laterally 

 and in posterior ventral part of head. Gula wide, brownish (Figure 821, B). 



Pronotum light yellow, mesonotum whitish yellow: dots pinkish brown, 

 setae dark (Figure 822). Metanotum membranous; medioanal setae long; 

 anterior angles with 5 setae, 2 of them long, the other 3 short, thin; 

 metasternum with 3 long, strong, black setae on each side. 



Propleuron (Figure 822, C) with lobe- shaped trochantin, as in Oe. furva; 

 long, black seta situated in about the middle, setule light. 



Claw of mid- and hind legs with thin, light basal spine; claw of hind legs 

 very thin, slightly curved. 



Gills on segments 2—7. 



Postsegmental pleural gill of segment 2 small, thin, covered in fixed 

 specimens by presegmental ventral gill of segment 3; segment 7 without 

 ventral gill. 



Tergite of segment 9 large, whitish yellow, with long, thick, pinkish brown, 

 medioanal and lateral setae posteriorly; anterior-angle seta also long but 

 thinner; intermediate seta and anterior-margin seta short, thin, situated 

 some distance from margin. 



Sclerite "b" of anal legs whitish yellow; setae reddish brown; 2 thick 

 setae above claw: one of lateral setae thick: median dorsal seta and second 

 lateral seta thin, shorter. Claw pink, with 2 large, dorsal denticles. 



Number and arrangement of gills of Oe c et i s sp. 1 



Segment 



Dorsal 



Pleural 



Ventral 





2 





1 



1 



3 







1 



4 







1 



5 







1 



6 







1 



7 











Case conical, slightly curved, made of symmetrical, rectangular plant 

 fragments in oblique rows which converge dorsally and ventrally near the 

 median line; large fragments interspersed with algae, which form whole 

 posterior part of case made by the young larva. 



Pupa. Length 10.5 mm in male pupa. Antennae coiled about 4 times 

 around posterior end of body. Labrum rounded, with large, median process. 

 Mandibles as inOe. furva, concave laterally between apical and basal 

 part; median blade serrated, 3 basal teeth larger than the others; lateral 

 setae strong, dark. 



Wings reaching abdominal segment 7. Mid tibiae without setae, tarsi 

 with dense natatorial setae. 



644 



