9 (8). Black transverse stripe of frontoclypeus wide, shining black, 



constant, and partly covering 2nd pair of dots; ventral side with 



short, dark stripes laterally; gills on segments 2—5 . 



5. M. nigra L. (p. 595) 



10 (7). Dorsal and lateral stripes narrow, ground color predominant; 



Siberia 6. M. sibirica Mart. (p. 598) 



464 Pupa 



1 (4). Gills present.. 



2 (3). Anal rod with hooked end 4. M. longicornis L. (p. 590) 



3 (2). Anal rod with slightly curved end ........ 5. M. nigra L. (p. 595) 



4 (l). Gills absent; apex of anal rod pointed, distinctly curved 



1. M. azurea L. (p. 581 ) 



1. Mystacides azurea Linne 



Pictet, 1834: Plate XII, Figure 5.— Hagen, 1864:232.— Ulmer, 1902c:489, 

 Figures 13— 15. — Struck, 1903:Plate III, Figure 9. — Ulmer, 1903:105, 

 Figure 65.— Siltala, 1905:69—70, 88— 91, Figure 17.— Ulmer, 1909:249, 311, 

 Figures 376 a, b.— Lestage, 1921:617—623, Figure 208 a, h, i.— Lepneva, 

 1940:211, Figure 2. — Macdonald, 1950:20— 22, Figures 1—4. 



Full-grown larva. Length 9.0— 10.5 mm. Main color of sclerites yellow; 

 pattern of dots distinct; stripes and spots not always distinct. Head oblong 

 (Figure 747, A); sensilla of antenna light, almost transparent. Frontoclypeus 

 with 3 pairs of dots near anterior margin, dots of middle pair more widely 

 separated than others; in posterior part, median dots of row distinct, lateral 

 dots indistinct. Dorsal stripes dark anteriorly, sometimes black, brownish 

 posteriorly, with 3 large dots along posterior part of frontal sutures; light 

 specimens lack stripes, only dots present; dark dots situated lateral to 

 coronal suture, on site of lateral stripes and laterally on ventral side near 

 occipital foramen. Gula brown (Figure 747, B). Setae thin, yellowish or 

 light brown. The intermediate and lateral of anterior-margin setae small; 

 anterior frontal seta like lateral seta; intermediate and posterior frontal 

 seta moderately long, situated close together. Seta 7 short, situated near 

 antenna; seta 9 long; seta 11 small, situated behind 9, both anterior and 

 medial to eye; seta 10 short, situated lateral to eye; seta 14 situated in 

 posterior part, the largest and thickest seta of the head; seta 12 smaller; 

 setae 15 and 16 still shorter, seta 13 short, all 3 lighter and thinner than 

 12 and 14; seta 17 large, thin, situated near fork of epicranial sutures. 



Labrum (Figure 747, C) with brown dorsal sclerite; median depression 

 distinct; setae 1 and 2 in form of large transparent spines curved inward; 

 median seta 4 small, straight, situated near median depression; seta 3 

 situated at anterior angle, straight, short, strong; setae 5 and 6 similar, 

 situated anteriorly. 



Mandibles (Figure 747, D) short, reddish brown; dorsal blade of left 

 mandible with 2 teeth in addition to distal tooth; ventral blade with 3 teeth; 

 right mandible with 2 teeth on each blade; lateral setae thin, light; ventral 

 seta slightly shorter and more basal than dorsal. 



581 



