1913.] NATURAL SCIENCES OF PHILADELPHIA. 243 



14. Ms separates from M1+2 at .75 to .83 of the distance from arculus 



to subnodus. 



15. Between Ms and M4 is (a) only one cross-vein proximal to the 



level of the subnodus and (6) one row of cells increasing to 



9 to 11 rows at the wing-margin. 

 17a. Between M4 and Cui are 3+ to 5 antenodal cells (sensu 



Selysii). 

 19. Between Cui and the very much angidated Cu2 is one row of cells. 

 '20. Area posterior to Cu2 with many branches from that vein and 



four (front wings) or five (hind wings) rows of cells between it 



and the wing-margin. 



21. Anal vein separates from the hind margin (a) at or slightly distad 



to the level of the arculus and therefore (6) much more distad 

 to the level of the cubito-anal cross-vein. 



22. More often no anal cross-veins."*^ 



Comparison of Argiolestes (icteromelas) with Phenacolestes. 

 (.4. icteromelas cf 9 , Victoria, Australia.) 



These two forms agree in the characters above numbered 1, 3, 5, 

 7, 8, 10, 11, 12, 14, 16, 18. 



These two forms differ in the characters given below; after each 

 number the difference shown by the Argiolestes is stated. 



2. Only two antenodals. 



4. Proximal edge of pterostigma nearh' as in Phenacolestes, but the 



distal edge much more oblique. 

 6. Longitudinal veins posterior to Mi with a stronger caudal 



curvature as they approach the margin. 

 9. M2 separates from Mi at four-tenths to one-half of the distance 



from nodus to stigma. 

 13. Arculus at or slightly distal to the second antenodal. 

 15. Between Ms and M4 is (a) one cross-vein proximal to the level 

 of the subnodus, and (6) at the wing-margin are 8-10 (front 

 wings) or 6-8 (hind wings) rows of cells. 

 17. Between M4 and Cui are (a) three (occasionally four) antenodal 

 cells and (6) at the wing-margin are two to three rows of cells. 



19. Between Cm and Cu2 at the wing-margin is only one row of cells. 



20. Area posterior to Cu2 with about two rows of cells. 



21. Anal vein separating from the hind margin distad to the levels 



(a) of the arculus, and (6) of the cubito-anal cross-vein, 



22. Anal cross-vein as stated above for Philogenia. 



« There is an anal cross-vein proximal to the level of the distal end of the 

 quadrilateral in the right front and right hind wings of the Queensland male and 

 in the right front and left hind wings of the female. In the other eight wings, 

 the first cross-vein in this part of the wing is at or slightly distal to the vein 

 descending from the distal end of the quadrilateral and therefore should perhaps 

 not be called an anal cross-vein, but a cross-vein posterior to Cu2. It has been 

 marked Cu2a by Mr. Williamson, 1913, p. 260. 



