The stalk of the abdominal gills of abdominal segments 1—8 consists of 

 a dorsal and ventral branch which forms almost a right angle; dorsal branch 

 covered with filaments on all sides, the ventral branch only on the outer side; 

 a gill bears to 30 filaments in the middle segments; a gill consists of 

 20—22 filaments on the anterior and posterior segments. 



Dorsal sclerite of segment 9 (Figure 192) yellowish brown; its anterior 

 margin curved, with a broad black margin; a shallow median notch at the 

 posterior margin; posterior margin of the small lateral lobes of the sclerite 

 with broad, brown stripes and 4 dark setae; marginal setae (medioanal and 

 anterior -angle seta) thick, dark and long; the intermediate and lateral setae 

 between them small and thin; setae at the anterior margin small, in form 

 of setules; lateroventral seta situated on the sides of the segment, as long 

 as the dorsal setae at the angle. 



Anal legs directed posteriorly and slightly laterally; laterodorsal 

 sclerite "b" with a black basal margin and a blackish brown basoventral 

 hook; the sclerite at the base of the hook dark, with a short seta; the oblique 

 longitudinal and transverse grooves of the basal part of sclerite "b" are 

 clearly marked; a group of large dots and a long, dark seta dorsally, near the 

 median margin of the sclerite; its side bears a long sword- shaped process; 

 the distal part of the sclerite is broadly striated in the middle with a short 

 thin basal seta and a long laterally projecting lateral seta; posteriorly and 

 distally, near the margin of the sclerite, is a large, blunt tubercle at the base 

 of which are two symmetrical processes for articulation of the claw. The 

 distoventral sclerite "c" consists of two parts: a ventral part with a short 

 seta and a larger external- lateral part. Claw uniformly curved, with small 

 ventral spines; seta 1 in the basal part the longest; seta 2 short; setae 3,4, 5 

 and 6 more or less long and dark; ventral setae 7 and 8 light yellow, curved; 

 seta 8 situated on a small tubercle (Figure 193). 

 216 Young larva. Length of 1st -stage larva 3 mm; width of head of 1st -stage 

 larva 0.27 mm, of 2nd stage 0.39-0.43 mm, of 3rd stage 0.57-0.61 mm, of 

 4th stage 0.81— 0.95 mm, of 5th stage 1.2— 1.4 mm. The young larva 

 resembles the full-grown larva, but head and thorax are relatively broader 

 (Figure 194). The dorsal side of the head of the lst-stage larva, labrum, 

 pronotum and sclerites of abdominal segment 9 dark brown; ventral surface 

 of head, maxillolabium and legs lighter than in the full-grown larva; the dark 

 color of the above organs disappears in the 2nd stage, and the sclerites are 

 mainly light yellow; the dark spot of the frontoclypeus becomes clearly 

 differentiated in the 3rd stage; posterior half of the pronotum darker than 

 the anterior half, but the dots indistinct; the frontal spot has almost the 

 same form in the 4th stage as in the full-grown larva; the dorsal and lateral 

 dark stripes of the head become distinctly separated; the pronotum retains 

 its lighter color; trochantin darker than in the full-grown larva. Setae of 

 head and thorax, especially the anterior -angle setae of the pronotum, relatively 

 longer than in the full-grown larva; however, the setae of the legs are short 

 as in the full-grown larva. The development of the setae on the pronotum 

 is shown in Table 1.* 



In the 1st stage, the trochantin forms an equilateral triangle with a 

 slightly concave anterior margin; in the 2nd stage appears a small anterior 

 fingerlike process; this process is already clearly marked in the 3rd stage, 

 but it is not completely formed even in the 4th stage. 



* After Nielsen (1942:341). 



224 



