— 480 — 



16. Limnophilus borealis (Zett.) subsp. mutabilis, subsp. n. 



44 rf(^, 65 ? 9 , Kulukoltzeva Prorva, on the river Kamtshatka, 12, 

 VIII. 1908, D er z ha vin. 



Id", 6??, Lukoltzeva Prorva, vicinity of Kljutshevskoe, 12. VIIL 

 1908, Derzhavin. 



13d"cr, 34$?, Kljutshevskoe, 23. VII -7. VIIL 1908, Derzhavin. 



ЗсТо', 1$, Ustj'-Kamtshatsk, VIII. 1909, Derzhavin. 



Differs from the typical form in following features: 



a) size smaller, length of the body 7,.^ —11 mm., usually about 

 10 mm. (in the typical form 12 mm.); b) anterior wings paler, mostly 

 pale yellow, wiih fuscescent or greyish markings in the 7-th and 8-th, 

 3-rd and 4-th apical cells; these markings are often absent; in the latter case 

 only the apical nervures are brown; smallest specimens commonly have 

 the wings with no markings; c) abdomen black. 



17. Platyphylax variabilis Mart. 



1 c?^ Kljutshevskoe, 11. V. 1909, Protopopov. 

 Id', Kljutshevskoe, 17. V. 1909, Derzhavin. 



18. Philarctus bergrotiii McLachl. 



Id', Ustj'-Kamtshatsk, 8. IX. 1908, Derzhavin. 



Id, Kulukoltzeva Prorva, river Kamtshatka, 12. VIII. 1908, Der- 

 zhavin. 



The species was hitherto known only from Western Siberia. 



19. Colpotaulius incisus Curt. 

 Id', Ustj'-Kamtshatsk, 8. IX. 1908, Derzhavin. 

 IcT, Kljutshevskoe, 31. VII. 1908, Derzhavin. 



20. Glyphotaelius mutatus McLachl. 

 1 $ , Kàmaki, 25. VI. 1909, Derzhavin. 



Fam. Sericostomatidae McLachl. 

 21. Brachycentrus subnubilus Curt. 



53 d^d", 5$$, Kljutshevskoe, 23. VI. 1909, Derzhavin, 



19, vicinity of Kljutshevskoe, 10. VII. 1909, Sapozhnikov. 



\2dd, 18?$, Ustj'-Kamtshatsk, 10. VI. 1908, Derzhavin. 



5с^с^, Srednij Ostrov, on the river Kamtshatka, 5. VI. 1909, Der- 

 zhavin. 



19, Kljutshevskaja Sopka, 8. VI. 1909, Kozlovskij. 



Specimens varying in color; some of them pale colored and clothed 

 with pale yellowish hairs. 



Revue Russe d'Entom. Xill. 1913. № 3—4. 



