10 PROCEEDINGS OF THE NATIONAL. MUSEUM art. 5 



MEGACERCOPIS OPTIMA, new species 



Plate 1, fig. 4 



Tegmen so far as preserved 19 mm. long, but the base (basad of 

 separation of Ciii+M from C1I2) is lacking, and the total length 

 would i^robably be about 23 mm.; width 7.3 mm.; fork of radius 

 14.6 mm. from apex; tegmen pale, with dusky spots and patches; 

 area above stem of radius suffusedly dusky; a dusky shade or line 

 (only well defined outwardly) crossing the tegmen beyond level 

 of fork of radius, receding basad at upper branch of radius (but 

 not at sector), at media and at cubitus, between media and cubitus 

 forming a semicircular mark; a small spot just below Cu, near base; 

 just beyond level of end of Cua are three large elongate patches, 

 the first between branches of radius, the second between radial sec- 

 tor and media, and the third just beyond and narroAvly connected 

 with the semicircular mark already described; just beyond the third 

 of these patches is another, through which runs a white line, bent 

 beyond the middle; in subapical region, bounded by vein connect- 

 ing radial sector with media, is a large oblong patch; margin of 

 nearly apical third of tegmen brown, the interrupting veins appear- 

 ing white. 



Tertiary of Kudia River, Siberia. 



H oloty pe.—Csit_^o. 69604, U.S.N.M. 



Scudder in 1895 remarked on the large size of the Cercopinae of 

 the tertiary of British Columbia. The present insect shows some 

 resemblance in its markings to Dawsonites veter Scudder, from the 

 British Columbia Tertiary, but the structure differs. In venation, 

 our genus suggests Scudder's Stenecphora, but the shape of the 

 ajjical part is quite different. 



The present Cercopid fauna of northern regions (about 25 species 

 in America north of Mexico) is an impoverished remnant of the 

 Cercopidae of tertiary time. 



Family CICADELLIDAE 



LAVRUSHINIA, new genus 



Tegmen (clavus missing in type specimen) long and narrow, 

 costa practically straight, apex broadly and symmetrically rounded ; 

 media leaving radius before end of basal third, the fork symme- 

 trical and rather wide; large discoidal cell between media and radius 

 elongated, squarely ti-uncated at the beginning of the middle 

 anteapical cell, but above narrowly contiguous with the cuneate 

 base of the cell in the radial fork, and below more broadly with the 

 large cell in the fork of the media, this last cell being truncate 

 apically, but cuneate basally, with a very long oblique side on cell 



