322 ME. H. BOLTON ON INSECT-EE31AINS FROM [Sept. 1912^ 



The subcostal area is strap-shaped; the costal vein gives off 

 four branches which pass oft' obliquely to the margin, extending 

 over tvro-fifths at least of the margin. 



The radial vein is less impressed upon the shale than the 

 subcostal, and the proximal portion of the stem is indistinguishable. 

 At a point in line with the last division of the subcostal vein the 

 stem of the radius is clearly seen. The radial vein is represented 

 by a portion of the main stem and two branches, the inner of which 

 breaks up into three rami before reaching the margin, while the 

 second, so far as it is preserved, shows no signs of bifurcation. 

 The forward course of the radius cannot be determined. Enough, 

 however, of the radius is seen to demonstrate that it must have 

 occupied the whole of the outer margin of the wing beyond the 

 subcostal margin. 



In this respect, and in the character of the subcosta so far as 

 shown, the wing-fragment agrees with the genus Pliyllohlatta of 

 Dr. Handlirsch. To this genus I refer it, but somewhat doubt- 

 fully because of its fragmentary and inconclusive character. 



I have pleasure in warmly acknowledging my indebtedness to- 

 Mr. J. W. Tutcher, who prepared enlarged photographs of the 

 wings, without which the work could not have been undertaken ; 

 to Mr. R. E. J. Bush, A.E.C.A., who prepared the wing-diagrams 

 from my rough drawings ; and to Dr. A. Handlirsch, of Vienna, 

 who has given me much help by advice and criticism. 



explanatiojN" of plates XXXI-XXXIII. 



Plate XXXI. 



Orthocosta splendens, gen. et sp. nov. (P. 310.) 

 Fig. 1. Impression of left wing. Natural size. 



2. Left "wiug (natural size), showing the outei- third with veins in I'elief, 



and the inner two-thirds with the marginal divisions of the median,, 

 cubital, and anal veins, lying in deep sulci. 



3. Restoration of wing-outline, showing portion preserved. Natural size.. 



Plate XXXII. 



Fig. 1. Pteronidia plicatula. gen. et sp. nov. (P. 313.) Inner half of the left 

 wing, showing the almost straight margin and plicate folding. Natural 

 size. 

 2. The same. Impression of the greater part of the left wing, sliowing stout 

 oblique cross-veins. Natural size. 

 ^ 3. The same. Eestoration of the left wing. Natural size. (This drawing 

 ought to be reversed, the tip to point to the left.) 



4. Cryptovenia moysetji, gen. et sp. nov. (P. 315.) Greater part of the 



left wing, showing the baekvvardly-curved tip. Magnified X 3-5. 



5. The same. Impression of the left wiug, showing the complex series of 



wrinkles crossing the marginal veins. Magnified X 3-5. (The pinnule 

 of Feurrq)teris, mentioned in the text, p. 317, is seen partly embedded 

 in the nodule under the wing-impression.) 



6. The same. Restoration of the left wing. Magnified X 2'5. (This 



restoration, like that of fig. 2, ouglU to have the tip turned to the left.). 



