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THE WINGS OF HOMOPTERA 291 



{i) SUPPLEMENTARY NOTE 



It has been shown in the preceding pages that in a Cicada, the Alem- 

 bracida?, and Jassida^, vein Ri is either absent or greatly reduced and that, 

 as a result of this, the two principal branches of radius are veins Ro+sand 

 R4+5. This fact suggests the possibility that the two branches of the 

 radius in the Psyllidas and the Aphididas are veins R2+3 and 4+5 and not 

 veins Ri and Rg as indicated in the accounts of the wings of these families 

 given above. But as I know of no observation demonstrating the atrophy 

 of vein Ri in these families, I have not felt free to change the determinations 

 of homologies of the branches of radius published by Miss Patch; and I 

 merely suggest that the method of the reduction of the radius in these and 

 allied families be investigated farther. 



