14 



PROCEEDINGS OF THE NATIONAL MUSEUM 



AKT. 5 



Fig. 4. — Part of venation of Plecia 



AMAGUA 



Related to P. atra Bnmetti, but with the fork of third vein even 

 narrower, in its basal portion less than half width of fork of fourth. 

 The fourth posterior cell is greatly widened on the margin; in this 



respect P. amagiia differs from 

 P. atra and resembles rather 

 P, fulvicoUis. 



PLECIA KUDIELLA, new species 



Plate 2, fig. 18 



Wing about 5 mm. long. 

 Differs from P. amagua. by 

 being smaller, with vein 3 much less curved downward at end, and 

 the fork (separation of 2 from 3) much shorter and more open, its 

 base considerably beyond vertical level of fork of fourth. The 

 wing is very pale, faintly reddish, with pale veins. The fork of 

 fourth vein is wide, its base about 320 [j-. from anterior cross vein, 

 the latter being about 160 [jl long. The fourth posterior cell is 

 Uttle widened apically, being about as in P. atra. 



Tertiary of Kudia River, Siberia. 



Holotijfe.—QdX. No. 69607, U.S.N.M. 



PLECIA REFRACTA, new species 



Plate 2, fig. 21 



Wing 9.6 mm. long, 3.8 wide ; moderately dusky throughout, with 

 pale veins. Upper branch of third vein (second vein) colorless 

 and difficult to see; fork of 

 fourth vein to anterior cross 

 vein about 430 /x, the anterior 

 cross vein about 480 /i long; 

 anterior cross vein more than 

 twice as far from base of third 

 posterior cell as from fork of 

 fourth vein; fork of third vein 

 very far beyond vertical level of fork of fourth, being about 1280 \i 

 beyond anterior cross vein; fourth posterior cell wide open at apex. 



Tertiary of Kudia River, Siberia. In addition to the type, four 

 other specimens are referred to this species. 



Eolotyfe.—OiX. No. 69608, U.S.N.M. 



PLECJA REDEMPTA, new species 



Plate 2 fig. 20 



Wing about 8.6 mm. long, dusky, with the upper part fuliginous, 

 the veins dark. This resembles P. ohsitula, but is distinct by the 

 much longer third (really second and third united) vein before an- 

 terior cross vein, the length of this section being 2320 pL (in ohsi- 



FiG. 5. — Part op venation of Plecia 



KUDIELLA 



