— 479 — 



rounded, with short pedicel; „dorsal plate" (representing, I think, the supe- 

 rior appendages fused together) yellow, broad and almost square above, 

 with hind margin excised in the middle and two oblique brown lines 

 on the sides; 10-th segment fuscous, forming a subquadrate plate, 

 nearly twice shorter than the dorsal plate. 



Length of the body 9 mm. 



This interesting genus (and species) ressembles, as to the nervu- 

 ration of the wings and, partly, the structure of the female genitalia 

 (superior appendages, 10-th segment), the genus Silo Curt. (Seiicosto- 

 matidae, subfam. Goerinae). 



11. Limnophilus abstrusus McLachl.(?). 



1$, Kljutshevskoe, 20. VIII. 1908, Derzhavin. 



1$, Ustj'-Kamtshatsk, 10. IX. 1908, Derzha vin. 



Reddish yellow, meso- and metanotum brownish; abdomen brow- 

 nish above, paler beneath. Anterior wings pale, fuscescent, with nume- 

 rous hyaline irrorations; fenestrate and anastomosai spaces rather distinct, 

 anastomosis fuscous; 3-rd apical cell triangular at base. 



$. Genital appendages as in L. politiis McLachl.; but the 

 lobes of the 10-th segment („tube") rather triangular from above and 

 at base broader than in L. politiis. 



Length of the body 12 mm. 



My opinion is these two specimens probably belong to L. abstru- 

 sus M с L a с h 1. 



12. Limnophilus nigriceps Zett. 



1$, Ustj'-Kamtshatsk, 10. IX. 1908, Derzhavin. 



13. Limnophilus picturatus McLachl. 



IcT, 1$, Ustj'-Kamtshatsk, 15. VII. 1909, Derzhavin. 

 1$, valley of the river Raduga, 13. VIII. 1908, Schmidt. 

 1 cT, 1 ? , Kulukoltzeva Prorva, on the river Kamtshatka, 12. VIII. 

 1908, Derzhavin. 



All specimens have yellow wings, witli no markings. 



14. Limnophilus despectus Walk. 

 1С, lake Lozhetshnoe, Kamtshatka. VII. 1909, Sapozhnikov. 



15. Limnophilus stigma Curt. 

 3(^cf, 8? $, Kljutshevskoe, 20. Vll- 2. VIII. 1909, Derzhavin. 

 2$ 9, Kljutshevskoe, 9 and 13. VII. 1908, В i a n с h i. 

 Id', Ustj'-Kamtshatsk. 10. IX. 1908, Derzhavin. 

 2$ ?, Kàmaki, 19. VII. 1909, Derzhavin. 

 Sd^d", 9?$, Kulukoltzeva Prorva, 12. VIII. 1909, Derzhavin. 



PyccK. Этом. Обозр. ХП1. 1913. № 3 -4. 32'- 



