those on distal part of trochanter shorter. Primary ventral setae of fore 

 femur in form of 2 strong, almost equally large spines; primary posterior 

 seta thin, slightly longer, situated basal to spines. Posterior seta of mid- 

 and hind femora situated distally, moderately long; one ventral seta of 

 midlegs situated in middle of segment, the other slightly shorter and 

 situated more basally; ventral setae of hind legs situated close together 

 in middle of segment, apical seta longer than basal. 



Number and arraiiE'ement of oills of P. n i gr i c or n i f 



Segment 



Dorsal 



Pleural 



Ventral 



2 





1(0) 



I 





3 





i 



L 





4 





1 



1 





5 











6 



1(0) 









7 



1(0) 







i(0) 

 1(0) 



Dorsal process of abdominal segment 1 absent; lateral processes well 

 developed, with a small, oval, pale yellow basal sclerite posteriorly. 

 Primary anterior-margin seta relatively long, black; medioanal seta also 

 large (about half as long as width of head), both on brown sclerotized dots; 

 intermediate and lateral seta smaller; secondary dorsal setae numerous 

 (about 100), many of them on sclerotized dots; about 125 small, secondary 

 setae ventrally in a median group together with 3 primary setae. 



Abdominal segments 2 — 7 with ventral elliptical areas, that of segment 2 

 smaller than others. Gills on segments 2 — 7. 



Anal sclerite of segment 9 light yellow, with brownish punctation at 

 anterior margin; medioanal and anterior- angle setae black, long (about 

 2/3 as long as width of head); intermediate and lateral seta also dark; 

 32 — 35 secondary, posterior-margin and surface setae, including several 

 dark, moderately long ones; smallest setae light. 



Sclerite "b" of anal legs (Figure 454) yellowish, light brown laterally in 

 distal part; distodorsal setae situated on membrane around sclerite, median 

 distal seta thicker and longer than others (2/3 as long as width of head), 

 ventral seta short, thin; surface with several secondary, including 1 — 2 

 moderately long, setae. 



Sclerite "c" light yellow, with wide, black lateral margin and a small, 

 basal seta. 



Claw brown, darker basally, dark brown apically, with a dorsal denticle; 

 setae as in Figure 455. 



325 



