Case shorter than in larva and attached at anterior end; posterior, 

 sievelike membrane situated inside tube some distance from posterior end, 

 which is narrow and rounded, covered with flat sand grains laterally. 



Mode of life and habitats. Brooks, rivulets, river channels. 



Distribution. USSR: Altai, Sayans, Eastern Siberia, Yakutia, 

 Maritime Territory, Amur Region, Kamchatka. In addition. North China, 

 Mongolia, Japan. 



3. Hydatophylax infumatus McLachlan 



Siltala, 1904c: 63- 66, Figure 15. - Ulmer, 1909:265, 268, Figure 400a. - 

 Hanna, 1957:218-222, Figures 1-14. - Lestage, 1921:766-768, 771-773, 

 Figure 271b, h. 



(278: 



278 



Full-grown larva. Length 19 — 25 mm. Head short, yellowish, brownish 



before eye and anteriorly on ventral side; pattern as in previously described 



species, variegated, with numerous 

 distinct dots. Frontoclypeus 

 (Figure 493, A) brown near ten- 

 torial pits, lighter in middle and 

 posteriorly near frontal sutures; 

 wedge-shaped pattern distinct, 

 consisting of dark dots. Numerous, 

 dense dots dorsally along sutures 

 behind eye and on sides. 



Labrum with dark spots near 

 median pit, and near setae 5 and 6. 

 Both mandibles with 5 distal teeth. 

 Maxillary palps very short. 



Pronotum (Figure 493, B) light 

 yellow, lighter than head, brownish 

 in some places; groove in anterior 

 third dark in middle; posterior 

 margin with wide, rounded, pos- 

 terior-angle process, black trans- 

 verse stripes of margin clearly 

 separated; dots numerous and 

 distinct, as on mesonotum; setae 

 situated on brown dots. Meso- 

 notum (Figure 493, C) yellowish 

 brown; posterior angle yellowish; 

 posterior margin light brown, 

 with a narrow black stripe in mid- 

 dle; posterior angle of margin 



broadly black. Tergites of metathorax; anterior median tergites fused. 

 Prosternite indistinct, yellowish; posterior margin pale. Ventral side 



of mesothorax with a row of dark sclerotized dots. Metathorax ventrally 



with several light dots. 



455 



4^4 



FIGURES 493 and 494. Hydatophylax infu 

 mat us McL. (after Siltala): 



49:3— larva: frontoclypeus (A), pronotum (B), 

 mesonotum (Cj, larval case (D); 494 — penis 

 sheatfi and genital appendages of male pupa. 



5725 



348 



