TABLE OF WING CELLS AND VEINS 



O, I. Costal Cell (undivided), or Costal Areolet. 



O, ifl*. The Humeral Cell ) 



O, la 2 . Second Costal Cell } Costal Cell, when divided. 



O, I b Subcostal Cell J 



O, 2. Marginal Cell (resting on V, 2). 



O, 3. Submarginal Cell (resting on V, 3). 



O, 4 1 . Cell resting on 4 1 (the 1st part of V, 4), a "basal " cell. 



O, 4 2 . Cell resting on 4 a (the 2nd part of V, 4). 



O, 4&. Cell resting on 46 (a lower branch of V, 4). 



O, 5 1 - Cell resting on 5 1 (the 1st part of V, 5), a "basal" cell. 



O, 5*. Cell resting on 5 2 (the 2nd part of V, 5), a "discal" cell. 



O, 5 3 . Cell resting on 5 3 (the 3rd part of V, 5), a "marginal" cell. 



O, 6. The Anal Cell. 



O, /.The Axillary Cell. 



0, 8. The Subaxillary Cell. 



O, 9. The Alula, or Axillary Lobe. 



V, c (or C). The Costal Vein, or Costa, bounding the front Margin. 



V, cia. Part of the Costa (often ciliated and spined) reaching to the 

 end of V, la. 



V, 1/7. The upper branch of the V, I. 



V, I b. The lower branch of the V, I. 



V, 2. Second (longitudinal) Vein. 



V, 26. Lower branch of V, 2. 



V, 3. Third or Cubital Vein. 



V, s. The "Vena Spuria," a thickening of the wing (characteristic 

 of Syrphidae), an imperfect V between V, 3 and V, 4 crossing 

 X, 4. 



V, //. A "Hang" V (or Appendix) a more or less irregular in- 

 complete V. 



V, 4. Fourth Vein, often much branching. 



V, 5. Fifth Vein. 



V, 6. The Anal Vein. 



V, 7. The Axillary Vein. 



X, Itf. The Humeral Cross-vein, connecting V, la to V, r. 



X, Ib. The Subcostal X-vein, connecting V, lb to V, !</. 



X, 2. Cross-vein connecting V, 2 to V, lb. 



X, 4. Discal, Middle, or Central X-vein. 



X, 5 1 . Lower Cross-vein, connecting V, 5 1 to V, 4. 



X, 5 a . Lower Marginal Cross-vein, connecting V, 5* to V, 4 (or to 

 some branch of V, 4). 



X, 6. Anal Cross-vein. 



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