6 short setae; 2 black long setae, which are almost as long as the anal leg 

 near the base of the articular rods; a similar but shorter seta on the outer 

 side, separated from the dorsal setae by a small lobe-shaped process. 

 Margin of sclerite with 7 setae ventrally; the dark basoventral seta longer 

 than the others. A longitudinal group of setae in the middle of the section, 

 near the basal margin. Sclerite "c" brownish, without seta. 



Claw strongly curved, ventral side with a row of light spinules in the 

 middle; the 2 distal spinules of this row longer than the others; the long 

 seta 6 situated on the outer side; the long seta 5 situated basal to the trans- 

 verse stripe; seta 8 situated ventrally; seta 7 very small, situated on a 



463 membrane; membrane with a pit slightly more dorsally; seta 1 situated on 

 the dorsal side, basal to the transverse stripe; the shorter seta 2 situated 

 more apically; the long seta 3, the longest seta of the claw, situated in the 

 basal part; the dark seta 4 situated on a membrane at the base of the claw. 



Pupa. Length 8—11 mm. Antennae filiform, moniliform at the end, 

 reaching abdominal segments 5—6 in male pupae; segments 4—5 in female 

 pupae; first segment of antennae thicker, 2nd segment longer than the 

 others; 1st segment with 2 dark, relatively long setae projecting in the same 

 direction as the setae of clypeus and labrum. Anteclypeus very short, 

 broad, separated from the labrum by a deep fold; its setae straight, dark, 

 longer than setae of labrum and lst-antennal segment; 2 of them situated 

 laterally and one slightly more medially. Surface of labrum and ante- 

 clypeus, shagreened, striated, tuberculate in some places; 4 setae relatively 

 long, forming a transverse row laterally; 2 small thin setae more medially; 

 one of them near the anterior margin, the second slightly further from the 

 margin; apical part of mandibles broader than in the other genera and less 

 strongly curved, separated from the broad base by a fold; surface of 

 mandibles tuberculate at the base; tubercles form dark denticles in the 

 basal part of the ventral side; ventral margin of blades finely serrated 

 (Figure 664). 



464 Wing sheaths extending to abdominal segment 4. Fore tarsus with sparse 

 natatorial setae on the first 3 segments, and with several setae on the 



4th segment. First four segments of mid-tarsi with dense, light, thin 

 natatorial setae, which are longer in the ventral row than in the dorsal 

 row. Presegmental plates present on segments 3—8, postsegmental plates 

 on segment 5. Presegmental plates of segments 3—5 small, strongly convex 

 (Figure 665), broader posteriorly, with 6 blunt, short, posteriorly-directed 

 denticles; postsegmental plates of segment 5 oblong, boat- shaped, concave, 

 with 10 pointed, anteriorly-directed marginal denticles that are obliquely 

 arranged near the lateral margin; convex presegmental plates of segment 6 

 of the same form as the postsegmental plates of segment 5, but situated 

 further medially; plates of segments 7 and 8 like those on segments 3—4. 

 Number of denticles as follows: 111:5-6; IV:5-6; V:6+ 12-14; VI:15-16; 

 VII:5-6; VIII:5-6.* 



Gills of abdominal segments 2 and 8 with one filament; gills of 

 segments 3—7 with two filaments on a common base. Lobes of last 

 abdominal segment short, broad, with straight posterior margin, pointed 

 inner angle and rounded outer angle; black moderately long setae posteriorly 



Siltala (1903:15) gives 3-9 denticles for segments 3-4, 7-8 and 8-15 and 7-13 denticles for the 

 plates of segments 5—6; I have not seen such numbers of denticles. 



527 



