25 
mapteryx , the only hitherto known Tertiary Ricaniid genus has many 
fanshaped radiating anal veins on Clavus, as seen in Scudder’s figure 
(Tert. Ins. North Amer. pi. VI. f. 34). This feature of course must be 
the starting point for the Clavus nervation of the living Ricaniidœ , 
and the new form, in this respect, obviously forms the intermediary 
between Hammapteryx and the recent Ricaniids. Hammapteryx and 
Eoricania agree in the respect that the bifurcation of Radius takes 
place a rather short way oil base (as far as may be estimated at 
about one third of the length of the wing, measured from base) whilst 
the bifurcation in the recent genera takes place more distally. 
Subcosta distally curves a little towards the margin which seems 
to indicate that it is proconvex in the outermost (missing) part of 
the wing (as in the recent genera Pochazia, Ricania etc.). Also in the 
distal part of one of the median Radius branches we meet with a 
similar proconvexity. Cubitus presents a much richer ramification 
than Médius, sending its branches almost equally in costal and anal 
directions. 
Retween Médius and Cubitus is seen an outwards interrupted 
(and apically bifurcated) line which looks like a vein, but which is 
most probably to be recognized as a fold or an edge of the wing. 
As to cross-veins I dare not state more than 3 small ones in a 
series close by the apex of the wing. 
