WINGS. 



41 



Fig. 14. Wing of Silvius. Comstock-Needhatn nomenclature. 



A third system is that proposed by Comstoek and 

 Needham about ten years ago, but which has found 

 practically no acceptance among dipterologists, with the 

 exception of one or two American writers. There is 

 much to be said in favor of a universal system of nomen- 

 clature among entomologists, a consummation devoutly 

 to be wished. The present work, however, is no place 

 for propagandism, and the common nomenclature has 

 been everywhere employed in the following pages. The 

 individual writer may do as he chooses in the use of 

 either of the three systems, though he would do well to 

 remember that ephemeral writings or briefer communi- 

 cations will suffer by the use of any except the standard; 

 only thorough monographic studies with abundant illus- 

 trations will do much toward commanding the acceptance 

 of either of the less used nomenclatures. I give below 

 in tabular form the synonymy of the three systems for 

 the Tabanus wing: 



Auxiliary vein . 

 First longitudinal . 

 Second longitudinal 

 Third longitudinal . 

 Fourth longitudinal 

 Fifth longitudinal . 



II Subcostal 

 IIIi Radial 1 . 

 III3 Radial 3 . 

 1114,5 Radial 4, 5 

 Vi,2 Cubital 1, 2 

 V3 Cubital 3 . 



Mediastinal 



Subcostal 



Radial 



Cubital 



Discoidal 



Postical 



