,,, NORTH AMERICAN DIPTRR \. 



der, and called the auxiliary vein, is the subcostal cell; 

 between the auxiliary vein and the costal border itself is 

 the costal cell. 



Finally, neai the root ol the wins;, a short, but very 

 constant cross vein connecting the auxiliary vein with 

 the costs is the humeral cross-vein (a). 



The above is the nomenclature of the wins; now having 

 almost universal vogue among descriptive entomologists, 



a system which, with minor modifications, has been used 



almost from the beginning ot descriptive dipterology. it 



has no especial superiority over other systems to com 

 mend it, nor has it any striking disadvantages to eon 



* SmImW,,/ 



Fig. 13. Wing of Pangonia. Schiner's nomenclature. 



1. costal cell; 2, mediastinal cell; 3, subcostal cell; 4, 5, cubital cells; 

 6, ;, 8,9, 11, first fifth posterioi cells; \i. discoidal cell; 13, 14, 15, 

 firsl third basal cells; 16, axillary cell. 



demn it; and long usage has apparently fixed it. An 

 other system in vogue at the present time among a few 

 dipterological ant hoi dies is that used by Schiner in his 

 later writings, and, which, could it displace the older 

 system, would have much to commend it. It will be 

 readily understood by the comparis< o oJ the two figures 

 given. The only contusion it makes with the older 

 system is in the use ol mediastinal cell for subcostal and 

 subcostal for marginal, and this confusion is actually 



apparent in the writings ot some authors, ol whom Yei 

 rail is an example. 



