PLATE I. 



Fig. i. Diagram of Syrphus: .l.=Antenna, Ar. = Arista, 0. =Ocelli, E. = 'Eye 

 (compound), F. = Frons, I'. = Vertex, Oc. = Occiput, H. =Hcad, Th. = Thorax, 

 Sc. = Scutellum, A/>. = Abdomen, h. = Haltere, S. = Squamula, i — liii. = ist 

 to 7th abdominal segments, /, //, /// = Fore, Middle and Hind Legs, Fe.= 

 Femur, 7'/=Tibia, 7"fl = Tarsi (.five), C7.=Claw, /V="Pad" or Pulvillus, 

 //«. = Humerus. Su = Suture, AC. = Pi st Alar Callus. 

 1 = Costa, 



2 = Subcosta (Mediastinal or. axiliary), 



3 = Radius 1 (isl longitudinal or Subcostal), 

 3 = Radius -'+3 (jnd longitudinal 01 Radial), 



5 = Radius (I -5 (3rd longitudinal 01 Cubital), 



6 = Media 1+2 (4tb longitudinal or Discal), 



7 = Media 3 + Cubitus 1 (5th longitudinal 01 Postical), 



8 = Cubitus j (5th luiigitiiiiin.il ni Anal cross-vein), 

 — Annal j (6th longitudinal or Anal), 



10= Anal 3 (Axillary), 

 n=Vena Spuria 01 false vein. 

 St. Stigma, 



12 -_ Humeral I Basal 1 ■i.'l) cross vein, 



13 Radio-median (discal or middle) cross-vein, 

 1 -I =Media 3 (Lower cr small) cross-vein, 



15 = Cubitus 1 1 ross-vein, 



id .Median (Lower marginal or pnMn.il) cross-vein, 



1st C. = First Costal (basal costal or Mediastinal cell), 



2nd C.=Second Costal (Mediastinal cell), 



Sec. = Subcostal (third costal cell), 



Ri = Radius 1 (Marginal cell). 



R3 = Radius 3 (Submarginal or Cubital cell), 



R5 = Radius 5 (Subapical or 1st posterior cell). 



M2 = Media 2 (Discal or 2nd posterior cell), 



Cui = Cubitus 1 (3rd posterior cell), 



R = Radius (Upper, tst basal cr radical cell). 



M = Media (Middle, and basal or radical cell). 



Ai = Anal 1 (Lower 3rd basal, radical or Anal cell). 



A2 = Anal 2 (Axillary cell), 



Alu = Alula (Axillary lobe). 

 Fig. 2. Side view of A', xgyplium : Fr. = Fions, F.-. Face, G. =Gena oi cheek, 



M. = Mouth, Um.= Upper Mouth-edge, Th. = Thorax, 5. = Suture, W. 



Wing. Sc. = Scutellum, Z?.r. =bas.al segment of abdomen, A. B.C. =Front, 



Middle and Hind Legs, r = Prothorax, 2 = Mesopleura, 3 = Pteroplcura, 



4 = Sternoplcura, 5 = Metapleura, 6 = Hypopleura, 7 = Plumula? 

 Fig. 3. Hypothetical primitive type of wing venation with the named cross-veins 



added (after Comstock & Xcedham). 

 1 lg. 4. Wing of Tipula (after Comstock & Needham)'. 

 i) 5. Paragus (Bgyptius, head front view. 

 11 6. Paragus tibialis, head front view, 

 n 7. Paragus segyptius, head in profile. 

 11 8. Sphserophoria flavic aitda, head in profile. 

 » o. Syrphus corolla, head in profile, 

 ii 10. Eristalis taniops, head in profile. 

 .. it. Lasiophthicus albomaculatus , head in profile. 

 11 12. Mesembrius capeusis, head in profile. 

 v> 13. Eristalis tenax , head in profile. 

 » 14. Eumerus amccnus, head in profile. 



