Pleuron of meso- and metathorax consisting of a small brown sclerite 

 with a blackish brown suture and with small, light spots with a brown border 

 near the base; trochantin forming a yellowish triangular sclerite contiguous 

 with the episternum; this plate has a narrow, reddish brown border at the 

 basal and posterior margin; a small, stout, dark seta near the distal end of the 

 border; both setules whitish, anteriorly to light part of the sclerite. 

 484 Prothoracic sternite (Figure 684) light; anterior margin narrow, reddish 

 brown; a broad, transverse, dark brown stripe in the posterior part. 



Mesothorax ventrally with a gill with 2 -segmented stalk; 1st segment of 

 style with 8 filaments, 2nd segment with 8 or 9 filaments. Metathorax with 

 2 ventral gills with 2 -segmented stalk; lateral gill longer, its basal segment 

 with 8 or 9 filaments; apical segment with 7 or 8 filaments; basal segment 

 of median gill with 3 filaments, apical segment with 6 or 7 filaments. 



Forelegs (Figure 685) prehensile, slightly shorter but more massive 

 than midlegs and hind legs; ratio of length of legs 86:100:112. Forelegs 

 brownish yellow, midlegs and hind legs yellow, without stripes or dots; 

 their ends with dark border or spots in some places. 



Fore coxa shorter but higher than mid- and hind coxa; distodorsal 

 depression shallow, not reaching middle of segment; dorsal surface slightly 

 concave posteriorly; anterior margin forming a crest with a small basal 

 • tubercle; crest with a number of short, dark setae (not at the margin of the 

 depression); primary basal seta situated a short distance from the tubercle, 

 relatively long, strong, dark brown; a primary posterior seta, which is 

 slightly shorter posteriorly, near the margin of the depression; 2 short, dark 

 setae further basally; 1 or 2 strong, brown setae and several small, light 

 setae further apically, at the margin of the depression, anterior surface with 

 2 short, yellowish setae (anterior primary setae?) and several smaller, light 

 setae; minute covering chetae numerous in distal part of anterior surface; 

 interspersed with several, flat, divided setae; setae of ventral surface small, 

 sparse; posterior distoventral seta dark brown, relatively long, much longer 

 than the small, strong, anterior seta; small, thin, light setae between them. 



Trochanter not closed; anterior primary seta distinct; 2 setae posteriorly, 

 a short seta situated in the middle and a long seta subventrally; setae of 

 anterior surface of trochanter including apical part of basal segment in form 

 of small covering spinules which are longer ventrally; ventral side with 

 numerous long, light setae, and 3 brownish, long, primary setae; a crest of 

 light spinules posteriorly and ventrally. 



Anterior surface of femur convex, posterior surface concave; dorsal 

 surface relatively broad, with a sharp anterior margin; an angle and small 

 tubercle in the middle of this margin. Primary basodorsal seta situated 

 at base of tubercle, directed anteriorly; distodorsal seta displaced to the 

 posterior margin; secondary dorsal setae mainly thin, sparse, light and 

 small. A longitudinal group of setae inclined to the ventral side anteriorly 

 and subdorsally; dark brown, spinelike setae predominate among them; 

 "^ ventral setae similar but longer, denser in the middle; a row of small, light 

 spinules posterior to them, along the crest; basodorsal, subdorsal and 

 ventral setae form a large brush (Lepneva, 1960:23, Figure 10); 3 long, 

 light setae in the middle of the posterior surface form a longitudinal row; 

 the basal of these setae light brown, longer and thicker than the other two; 

 several small or very small setae more basally and dorsally; primary 

 posterior seta situated subventrally, strong, dark, long; a thin secondary 

 seta near it. 



552 



