VOL.68 TERTIARY INSECTS FROM SIBERIA COCKERELL 9 



4 mm. long, gently curved, the apex of the tegmen obtuse, not 

 pointed, apex and outer margm being formed as in the oriental 

 Thoodzata princeps Distant, whereas in modern Aphrophora the 

 togmen is more pointed. Venation as in Aphrophora^ with the 

 radius curved, not straight as in Thoodzata; distance between 

 branches of radius slightly greater than distance between lower 

 branch and upper branch of media. Base of tegmen with the 

 elongate-inclosed area above radius (formed by the subcosta) whitish, 

 but the area between subcosta and costa dark-brown; below the 

 radius the basal part of the tegmen is colorless, except for a very 

 large obtusely cuneiform (pointed basad) mark through the middle 

 of which runs the stem of the media; a very broad colorless band 

 across tegmen 3.7 mm. from base, its outer margin reaching fork 

 of media, its lower end narrowed; beyond this light band is a 

 large brown area about 3 mm. long, its upper portion darkest, the 

 principal veins remaining pale as they cross it; next, and about 

 8 mm. from base, is another transverse colorless band, very broad 

 above, with an obtuse extension along lower branch of radius, below 

 much narrowed, and ending in an extremel}' oblique band crossing 

 lower branch of media, directed basad; next follows a brown band, 

 shaped rather like the pale one, but abruptly bent apicad and very 

 narrow on lower branch of radius; apical area pallid, apparently 

 more or less brownish. The radius forks about 1.8 mm. beyond 

 level of fork of media. 



Tertiary rocks, Kudia River, Siberia, 



Holotype.—Q2it. No. 69603, U. S. N. M. 



A very beautiful fossil, not satisfactorily separable from Aphro- 

 phora^ but not like the European tertiary species assigned by Heer 

 to that genus. Both shape and pattern recall the allied genus 

 Thoodzata Distant, from Tenasserim. 



MEGACERCOPIS, new genus 



Tegmina large ; costa only slightly arched ; apex broadly rounded ; 

 lower margin (clavus present) straight; stem of radius directed 

 obliquely upward, but no less than 3 mm. below costa, giving rise 

 to a rather broad symmetrical fork, the upper branch passing some 

 distance below costa, and at the end abruptly deflected downward to 

 meet the radial sector, this being anterior to the similar curved 

 vein connecting the sector with the media ; media emitting four 

 inferior branches to the margin, which appear as pale lines on a 

 dark ground; Cua (in sense of Tilly ard) strong and straight; only 

 the extreme tip of first anal preserved, this about 7 mm. anterior 

 to end of Cua- 



Type. — Megacercopis optima^ new species. 



