IOWA ACADEMY OF SCIENCE 
75 
General. 
Subcostal (Sc) 
Radial (R) 
Radial sector (Rs) 
Medial (M) 
Medial one (Mi) 
Medial two (M 2 ) 
Medial three (M3) 
Cubital one (Cui) 
Cubital two (CU 2 ) 
Arbitrary. 
Cubitus, 
Cubitus 
Stigmal 
Third Discoidal 
Third Discoidal, first fork 
Third Discoidal, second fork 
Third Discoidal 
Second Discoidal 
First Discoidal 
Bibliography. 
1893 Comstock, Evolution and Taxonomy. 
1898 Comstock and Needham, The wings of Insects. 
1899 Comstock and Kellogg, Insect Anatomy. 
Exlanation op Figures. 
Fig. 2. Wing of Macrosiphum sp. 
Fig. 3. Wing of young nymph. Macrosiphum sp. 
Fig. 4. Wing of older nymph. . Macrosiphum sp. 
Fig. 6. Wing of Pemphigus sp. 
■ Ty.; 
Fig, 7. Wing of Phylloxera vastatrix. 
