6 (5). Setae present along the whole first segment of fore tarsi, lateral 



seta of clypeus not always short, sometimes long 



3. Holocentropus McL. (p. 498) 



7 (2). All setae of labrum short 4. Cyrnus Steph. (p. 510) 



8 (l). Lobes of anal appendages rounded laterally, pointed; subapical spurs 



of hind tibiae of the same length 5. Neureclipsis McL. (p. 519) 



1. Genus Plectrocnemia Stephens 



Full-grown larva. Length 20—22 mm. Head large, slightly broader than 

 pronotum; eyes small. A transverse elliptical or rhomboidal light spot, 

 which is sometimes divided on the frontoclypeus between the curvature of 

 the frontal sutures; posterior to this spot a posteriorly-curved row of 

 6—8 dots; 2 oblique rows of 4 dots anterior to this spot; one of them, a dark 

 small posterior dot, situated at the curvature of the frontal sutures. Dorsal 

 stripes closely contiguous to the epicranial suture, with coarse dots; their 

 outer margin not always distinct; lateral stripes broad, pale, with numerous 

 minute dots and a few coarse dots. 



Anterior part of pronotum light; a dark slightly curved transverse stripe 

 with coarse dots in the middle of each half of the sclerite; posterior to the 

 stripe, some distance from it dots forming an irregular arc, which is inter- 

 rupted at some points; arc convex posteriorly. Two or three dots situated 

 laterally, near the posterior half of the median suture. 



Fore tibia, fore tarsus and fore claw of almost the same length or of 

 slightly different length; tarsus ventrally with a comb of short, golden 

 yellow spinules. Claw thin, slightly curved; basal seta forming a straight, 

 thin, light spine. 



Section "a" of anal legs longer than section "b, " broader at the base than 

 at the end; posterior third of section "a" with a shallow constriction; 

 numerous secondary setae ventrally and on the sides. Dorsolateral sclerite 

 of section "b" light yellow, with indistinct coarse dots or with groups of 

 minute dots. Claw long, thin, slightly curved, with a double comb of fine 

 spinules ventrally and a subapical band of slightly longer spinules, which do 

 not extend to the ventral side. Five anal gills. 



Pupa. Length of male pupae 10.0—11.5 mm, of female pupae 12 mm. 

 Antennae of male pupae reaching abdominal segment 9, antennae of female 

 pupae segment 6. The lateral seta of the 3 setae of the clypeus, very 

 small, almost setuliform; the other two are long; posterior part of labrum 

 with two similar long setae anterior to them; other 4 setae of labrum small. 



Wing sheaths reaching abdominal segment 4. Mid-tarsi with thin delicate 

 natatorial setae on segments 1 and 2; fore tarsi without setae. Hind tibiae 

 422 with subapical spurs of different length. Gills present on segments 2—7; 

 gills on segment 2 with one filament; gills of the other segments with two 

 filaments; dorsal branch of gills on 1 or 2 posterior segments shorter than 

 ventral branch. Presegmental plates present on segments 3—7, post- 

 segmental plates on segment 5. Anal appendages rounded, widely separated, 

 with numerous stiff dark setae. 



Pupae lying in a long case with thick walls covered with coarse sand 

 grains or detritus. 



475 



