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Seta 1 situated subdorsally on median side of basal part, strong, moderately 

 long, dark brown; seta 2 thin, slightly longer, brown, situated at end of 

 suture; seta 6 situated nearby distal to suture, thin, shorter; seta 3 black, 

 situated dorsally on median side of dorsal part, thicker than others, long, 

 almost as long as claw; short, ventral, setae 7 and 8 thick, pale yellow; 

 seta 5 thin, dark, situated laterally near seta 8; seta 4 same, situated near 

 seta 8. 



Case (Figure 486, A) made of detritus, usually fragments of wood 

 arranged densely and obliquely; surface rough; fragments sometimes large; 

 a long rod sometimes projects posterior; ventral surface usually smoother. 

 Another type of case also occurs as in Potamophylax nigricornis 

 (Figure 486, B); it is flat as inNemotaulius punctatolineatus, 

 made of oval fragments of leaves which overlap dorsally and ventrally; 

 dorsal and ventral walls meet with the dorsal usually projecting above 

 the ventral. 



Mode of life and habitats. Brooks and rivulets with a varying 

 current (Maritime Territory, Sitsa River from source to the lower reaches; 

 Odarka River, Ugodinza River, channel of the Khor River); at a tem.perature 

 to 24° in summer (channel of the Khor). 



Distribution. USSR: Maritime Territory. In addition. North China. 



f 



2. Hydatophylax nigrovittatus McLachlan (Platyphylax 

 n i g r o V it t at u s McLachlan), larva nova 



Full-grown larva.* Length 22 — 28 mm. Main color yellow, in some 

 places orange-yellow; punctate pattern, variegated as in H. ma gnus, 

 consisting of rows and groups of large, dark dots on orange-brown back- 

 ground, and similar dots at base of setae (Figure 487). Frontoclypeus 

 brownish near tentorial pit, with a narrow, golden brown stripe on posterior 

 part of frontal suture. Large setae relatively thin; setae 9 and 14 of about 

 the same length, slightly thicker than anterior-margin and middle frontal 

 setae; seta 10 small, light; setae 11 and 13 thin, brown, relatively large; 

 seta 12 dark, strong, moderately long; seta 15 thin, brown, long; seta 16 

 small, light, situated immediately behind 15; seta 17 strong, dark, mod- 

 erately long, shorter than middle frontal seta. 



Dorsal sclerite of labrum mainly brown, with darker, chestnut brown 

 areas in each half; a small, dark dot behind median pit. 



Mandibles black, with narrow, reddish brown apex; middle and subventral 

 tooth of left mandible large, projecting, larger than others, 2 teeth and a 

 pointed process dorsal to them, a small tooth ventral to them; subventral 

 tooth of right mandible larger than others, 2 large teeth and one smaller. 



The species of the larva was determined in Khabarovsk by I. M. Levanidova from full-grown larvae, 

 pupae, and adults of both sexes, collected inthePavlenkovskayaProtoka of the Khor River and in the channel 

 from Lake Teploe to the Biru River. Full-grown larvae were found in the following localities: Pavlenkov- 

 skaya Protoka, 23 December 1948, 3 specimens, 13 November 1949, 12 specimens; Pavlenkovskie 

 Springs, 23 January 1950, 2 specimens; pupae and adults: Pavlenkovskaya Protoka, 2 June 1949, 

 adults of both sexes; in the channel from Lake Teploe and at the shore, 25 May 1952, 3 pupae, 1 male; 

 5 June 1953, 5 adults of both sexes. The exuviae from the pupal cases from the channels of Lake Teploe 

 (25 May 1952) were identical with those of larvae from the Pavlenkovskii channels (18 November 1949) 

 and full-grown larvae from the aforementioned collections. 



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