VOL.68 TERTIAEY INSECTS FROM SIBERIA COCKERELL 11 



between media and cubitus; the usual upright cross-vein (sup- 

 posedly end of subcosta) from upper subapical cell; the usual three 

 rather short (but longer than high) apical cells, truncate basally, 

 the middle one not extending so far basad as the others; cubitus 

 straight; a broadly lanceolate cell beyond its end, at the anal 

 corner, contiguous for an equal distance with the lower subapical 

 and lower apical cells; marginal vein hardly separate from margin, 

 except narrowly at the anal angle. I follow Tillyard's nomencla- 

 ture, but the ambient vein, which he describes as specially charac- 

 teristic of Membracidae, also exists in Cicadellidae, and sometimes 

 is quite evidently separated from the margin. 



Type. — Lavrushinia elegantula, new species. 



I am at a loss to identify this wdth any modern genus. The vena- 

 tion varies so much within the genus in this family (as in Deltoce- 

 phalus), that the tegmen alone is not very satisfactory for generic 

 determination, but it seems probable that we have to do with an 

 extinct genus. There is some resemblance to such genera as Tetti- 

 gonieUa and Helochara. Chunra of Distant differs at once by hav- 

 ing the ambient vein widely separated from the margin, as Tillyard 

 describes for the Membracidae. 



LAVRUSHINIA ELEGANTULA, new species 



Plate 1, flg. 2 



Tegman 6.5 mm. long, 2 broad (clavus missing) ; dilute fuliginous, 

 with strong brown veins, costal margin dark, and stigmatic region 

 infuscated. 



Tertiary of Kudia Kiver, Siberia. Found by Mr. A. I. Laxrushin, 

 after w^hom the genus is named. 



Holotype.—C^t. No. 69605, U.S.N.M. 



Family CIXIIDAE 

 MUNDOPOIDES, new genus 



Resembling the oriental genus Blundopa Distant, but with nearly 

 straight costa, obliquel}^ truncate apex and almost straight outer 

 margin, giving the tegmen a very mothlike aspect. A sharp, simple 

 subcosta running just below the costa, ending on margin about mid- 

 dle of tegmen; radius running about a third of depth of tegmen 

 below costa, a little before middle of wing emitting two long very 

 oblique branches above; apical area, beyond the second pale band, 

 with widely separated, not dense, longitudinal veins. Clavus miss- 

 ing in the type. The tegmen is black, with two broad light bands, 

 as in the Cercopids Tomaspis and Gosruoscarta^ but the structure 

 is not that of Cercopidae. The outer margin is very narrowly pale, 

 as in Giocixius. 



Tyjje. — Mundopoides cisthenaria^ new species. 



