VOL.68 TERTIARY INSECTS FROM SIBERIA COCKERELL 15 



tula only 1470 \i.) The second posterior cell (fork of fourth vein) 

 is also much wider, the width about middle 1200 {x (in obsitula 

 800 [jl). Anterior cross vein to fork of third, about 1280 yi; to fork 

 of fourth about 590. 



Tertiary of Kudia Kiver, Siberia. 



Holotype.—CsLt. No. 69609, U.S.N.M. 



PLECIA KUZNETZOVI, new species 



Plate 2, fig. 19 



Win^ 7 nun. long; differs from P. obs'itula in being smaller, paler, 

 with upper branch of fourth vein nearly in a line with stem (in 

 obsitula^ redetnpta, and refracta it is abruptly elevated at base), and 

 second vein after separation from third nearly parallel with the 

 latter. The third vein before anterior cross vein is 1.4 mm. ; fourth 

 posterior cell widely open at apex; anterior cross vein only about 

 half as long as in P. redeinpta., its distance from fork of fourth about 

 430 (JL. 



Tertiary of Kudia River, Siberia. 



Holotype.—Qai. No. 69010, U.S.N.M. 



Under a lens, it looks as if the second vein came from the first, but 

 this is quite illusory, being due to a clouding of the wing at this 

 point. The species is named after the discoverer of the deposit. 



PLECIA OBSITULA, new species 



Plate 2, fig. 17. 



Wing 8.3 mm. long, 3.4 wide, dusky, with mainly dark veins, the 

 costal region broadly suffused with fuliginous; fork of fourth vein 

 distant from anterior cross vein nearly 1.5 times the length of 

 cross-vein ; cross vein slightly beyond midmost point between separa- 

 tion of third vein and its fork; anterior cross vein conspicuously 

 closer to fork of fourth than to base of third posterior cell, but not 

 nearly twice as close ; fourth posterior cell widely open at apex ; an- 

 terior cross vein to fork of third twice as far as to fork of fourth; 

 upper branch of third (really second) vein abruptly elbowed at 

 base. The type appears to be a male; two specimens with broader 

 and paler Avings are presumed to be females, the sexual difference 

 being as in modern species. 



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

 men, six others are referred to this species. 



E oloty 2)6.— Ciit. No. 69611, U.S.N.M. 



In Protoplecia, from the Upper Lias of Mecklenburg, the fork 

 of third vein is far anterior to the vertical level of fork of fourth, 

 which woidd seem to indicate that the condition observed in P. 

 amagud is the more primitive. From the same European deposit, 



