2l8 



NEW YORK STATE MUSEUM 



course and .are generally clearly recognizable. They will be desig- 

 nated in this paper by the following names and abbreviations for 

 them : 



Costa (C) 



Subcosta (Sc) 



Radius (R) ^ 



Media (M) 



Cubitus (Cw) 



Anal veins (ist A, 2d A, 3d A) 



On the accompanying diagram [fig. 11] of a crane fly wing these 

 principal veins are designated at the base by the abbreviations given 

 above. It will be observed that the radius is distinguished by the 

 possession of a very large and conspicuous posterior branch. This 

 branch is called the radial sector {Rs). All other branches are 



Fig. II 



designated by number, the numbers beginning at the front and con- 

 tinuing posteriorly, the number being added to the symbol for the 

 vein, for any branch to which it belongs. For example the branches 

 of the radial vein are labeled R^, R^, R^, R"^, and R^. The costa 

 is simple and lies on the foreborder of the wing. The subcosta 

 is two branched and bears a short apical fork, but the divisions 

 of this fork, running as they do into costa and radius respectively, 

 have usually the appearance of cross veins. The radius gives off 

 its sector as already noted, and this in turn is dichotomously 

 twice forked. Media likewise has a manner of forking essentially 

 like that of the radial sector, and cubitus is once forked. Al- 

 though the anal veins are usually simple, the second of them is 

 occasionally forked at the tip. 



