152 



Pupa. Length 20— 25 mm. Antennae reaching end of segment 8 in 

 male pupae, end of segment 6 in female pupae. 



Mandibles with very narrow apex; median blade slightly serrated. Wing 

 sheaths reaching middle of segment 4 or beginning of segment 5; posterior 

 margin of sheath of forewings with a shallow indentation, as in the adult. 

 Mid -tarsi natatorial, segment 1 of hind tarsus also natatorial. 



Dorsal process of abdominal segment 1 long, large, saddle -shaped, with 

 small spinules. Holding apparatus on segments 3—7; number of spinules: 

 111:1-3; IV:2-6; V:4-6+ 11-24; Vl:3-6; VlI:3-6. Gills as in larva. 



Anal rods (Figure 2 54) slightly wider at the end, slightly curved upward; 

 2 small setae near their base; one of the 4 small, dark setae situated in 

 basal part of rod, the second in middle, the other 2 apically. 



Before pupation or some time before hibernation, the larva changes 

 the case by replacing the laterally projecting leaf fragments with less 

 large fragments. The larva attaches the pupal case and covers it with 

 loosely interwoven, large fragments; the anterior and posterior sievelike 

 membranes are situated inside the case some distance from the end; 

 anterior membrane with about 20, posterior with to 40 holes. 



Mode of life and habitats. Stagnant water, among vegetation 

 in the littoral zone of lakes; detritophagous. Full-grown larvae appear 

 in early spring, the first pupae in May. 



Distribution. Northern, northwestern, western, and central parts 

 of the European USSR; Western and Eastern Siberia, including Baikal 

 area. In addition, Europe. 



2. Nemotaulius admorsus McLachlan,* larva nova 



Full-grown larva. Length 30—32 mm. Head mainly reddish brown 

 (Figure 255, A); stripes distinct, as inN.punctatolineatus, dark brown 

 or blackish brown; median stripe of frontoclypeus broader than in 

 N. punctatolineatus and reaching middle frontal setae; anterior 

 punctation, dark; wedge-shaped pattern of posterior part consisting of 

 small, light dots. Dorsal stripes as inN.punctatolineatus joined 

 at coronal suture and forming a characteristic dark, curved pattern; 

 dots not light*-'' as in N. punctatolineatus, but dark, dots on stripe 

 indistinct, dots lateral to coronal suture distinct, chestnut brown. Lateral 

 stripes absent, replaced by sparse punctation; a small, indistinct, grayish 

 spot anteriorly, connected with dorsal stripes by a narrow, dark, transverse 

 bridge; short, longitudinal rows of 4—5 distinct, chestnut brown dots on a 

 brownish gray background near occipital foramen from coronal suture to 

 lateral stripes. Ventral surface dark posteriorly, with small, chestnut 

 brown dots. Gula light, with long posterior end (Figure 255, B). 



Setae as in N. punctatolineatus; setae 9 and 14 as long as in that 

 species. 



Labrum golden brown; setae 1,2,3, and 4 light; 5 and 6 dark brown; 

 setae setae as in N. punctatolineatus. 



Mandibles black, oblong; right mandible with 4 large teeth and a 

 small tooth; left mandible with 5 teeth; brushes orange -yellow; lateral 

 setae small, light, situated basally, dorsal slightly larger than ventral. 



" Glyphotaelius ad mo rs us McL. of authors. The species was determined by I. M. Levanidova, who 

 reared the larvae into pupae and adult males. 

 ■" According to preparations. 



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