380 thin, moderately long; distal margin of episternum indistinct, reddish brown, 

 3 setae near margin, 2 of them long, the 3rd (at suture) thinner and shorter; 

 a light setule anteriorly on membrane. 



Metapleuron broadly triangular; epimeron much larger than on 

 metathorax, ventral process whitish, pale, indistinct, brownish only at base; 

 episternum with 4 moderately long setae at distal margin, fifth seta situated 

 on membrane, thinner and smaller than others; a light setule at margin. 



Form, size, and chaetotaxy of legs as in B. s u b nu b i lu s; legs darker, 

 reddish brown, dark brown in some places. 



Basodorsal seta of fore coxa strong, dark reddish brown, moderately long; 

 anterior apical dorsal seta also situated in basal part, short, brown; one 

 primary anterior seta situated basally at dorsal margin; 2nd primary 

 anterior seta situated in middle of coxa, both branched apically; posterior 

 distodorsal seta situated at apex of depression, moderately long; 2 thin, long, 

 secondary setae situated at margin of depression; subdorsal surface with 

 2 thin, moderately long, secondary setae; primai^y distoventral setae thin, 

 moderately long, posterior seta situated subventrally. 



Anterior seta of trochanter short, branched apically; posterior seta very 

 thin, slightly smaller; basoventral seta thin, strong, brownish, moderately 

 long; anterior distoventral seta in foi-m of small, yellowish spine; basal 

 tubercle distinct, lai-ger than in B. subnubilus; anterior ventral subapical 

 seta represented by a slightly thinner and larger light spine; both posterior 

 ventral setae thin, moderately long, situated apically and subapically, larger 

 than in B. s u b n u b i 1 u s; distal part of ventral margin with dense, light, 

 feathered chaetoids. 



Primary dorsal setae of femur apical and basal, short, yellowish, 

 accompanied by a secondary seta; anterior seta situated subapically, short, 

 brown, branched apically; postei'ior seta situated subventrally at distal 

 margin, short, spine-shaped, yellowish; primary distoventral seta repre- 

 sented by moderately long, light spine near margin; 2nd ventral seta in 

 form of much smaller spine in middle; ventral margin with row of strong, 

 dense, snnall spinules situated behind feathered chaetoids anteriorly; distal 

 margin with a group of small, thin spinules posteriorly. Tibia and tarsus 

 dark brown, setae and spinules as in B. s u b nu b i 1 u s. Claw and its seta as 

 in B. subnubilus. 



381 Mid- and hind femora with indistinct dorsal stripe. 

 Gills only on dorsal side on segments 2 — 7. 



Tergite of segment 9 brownish, with indistinct margin; setae situated 

 on membrane behind tergite, 11 on each side; median and adjacent 

 (intermediate?) seta long, reddish brown, larger than others; anterior-angle 

 seta brown or grayish brown, thin. 



Sclerite "b" of anal legs brownish, whitish at median margin, with a 

 ventral process in form of a narrow stripe; 13—15 reddish brown setae at 

 distal margin; median distal, and neighboring seta long, thicker than others; 

 4—5 lateral setae shorter and thinner; ventral seta short, light, very thin. 

 Sclerite "c" brownish, with a small, light seta. 



Claw with large, reddish brown apex; 3 large, dorsal denticles; seta 1 

 situated in basal part, short, reddish brown; seta 6 short, situated near end 

 of suture; seta 2 moderately long, situated dorsal to 6; seta 3 similar, 

 situated near denticles; setae 7 and 8 straight, light, short; seta 5 light, thin, 

 situated laterally near 8, and slightly longer than 8, seta 4 small, light, 

 situated medially. 



477 



