Number and arrangement of gills ofO. striata 



Segment 



Dorsal 



Pleural 



Ventral 



1 











2 



1 



1 







3 



1 



1 







4 



1 



1 







5 



1 



1 







6 



1 



1 







7 



1 



1 





1(0) 



8 





1 







47 



47 



Ventral spiniform setae of mid- and hind femora thick, apical setae 

 shorter, darker, and thinner than basal setae. Subapical anterior 

 distoventral seta in form of thick, reddish brown spine, like the posterior 

 apical ventral seta, but slightly longer and thinner; both apical ventral 

 setae of hind tibia thick, spiniform, dark brown, situated closer to each 

 other than on the midlegs. 



Dorsal process of abdominal segment 1 long, pointed (Figure 65); a 

 dark, longitudinal stripe between the median and lateral processes, wider 

 but less distinct than on the thoracic tergites; small anterior -margin 

 seta and large medioanal setae situated in the middle on the dark stripe; 

 anterior -angle seta situated on the lateral process, which has a crown of 

 sm.all, light, spiniform chaetoids, and a large lateral seta. The dark parallel 

 lines are also distinct on the abdominal tergites in well marked specimens, 

 so that there are 2 wide, dark parallel stripes from the dorsal stripes of 

 the head to the posterior margin of segment 8, as described by Miall (l895). 

 The stripes are distinct in lighter larvae in anterior part of body, indistinct 

 or absent posteriorly. 



Tergite of abdominal segment 9 small, chestnut brown, darker in naiddle, 

 surrounded by wide, light stripe; medioanal seta black, long, almost twice 

 as long as the segment, lateral seta moderately long, dark; intermediate 

 seta and anterior -margin seta short, light; anterior -angle seta situated near 

 sclerite, short, thick, dark, smaller than lateral seta. 



Sclerite "b" of anal legs brownish at the base, with dark reddish brown 

 marginal stripe near the dorsal setae apically; setae dark, situated 

 on the membrane, on large dark sclerotized dots; mediodistal seta short, 

 thin, ventral seta shorter, thick. Sclerite "c" yellow, with brownish outer 

 stripe; seta short, dark. 



53 



