124 



Annals Entomological Society of America [Vol. 11^ 



HISTORICAL DISCUSSION.* 



As is the case with other groups of insects the names appHed 

 to the wing veins of aphids were given in the first place without 

 homological reference to the veins of other insects. That is, 

 we have an arbitrary s^^stem which has no significance outside 

 the family of Aphididae. Recently several papers have appeared 

 which rename the wing veins with this aim in view, but as the 

 true homologies of the wing veins themselves have not heretofore 

 been established, certain mistakes in applying the Comstock- 

 Needham nomenclature have, of necessity, arisen. These papers 

 will be discussed in turn. First, however, it would seem of inter- 

 est to review the earlier terminology. 



For convenience in this discussion attention is called to Fig. 

 8, in which the names are used as based upon the homologies re- 

 vealed in the study of the tracheation of the wings as recorded 

 in this paper. 



The following table will show the relation of the Comstock- 

 Needham terminology to the terminology previously in use for 

 the wing veins of aphids : 



After Buckton 



Costal Nervure 

 Cubitus or post-cos- 

 tal nervure 



Current terminology 



Fore Wing 

 Costal 

 Subcostal vein 



Stigmatic 

 First furcal 

 Second furcal 

 Cubital nervure 



Second oblique 

 First oblique 



Cubitus or post 



costal nervure 



Second oblique 



First oblique 



* For careful general 

 MacGillivrary, A. D. ('06). 



Stigmal vein 

 First branch 

 Second branch 

 Third discoidal or 

 cubital 



Second discoidal 

 First discoidal 



Hind Wine 

 Subcostal vein 



&• 



Second discoidal 

 First discoidal 



Comstock-Needham 



(See fig. 8) 

 Costa (C.) 

 Subcosta (Sc) 

 RadiuSi (RJ (together 



with basal portions 

 of the remaining wing 



veins) . 

 Radial sector (Rs) 

 Media (MJ 

 Media (M,) 

 Media (M) 



Media 3-^^ {M, + ,) 

 Cubitus (Cu) 

 First Anal (ist A.) 



Radial sector (Rs). 



Media (M.) 

 Cubitus (Cu.) 



historical discussion of studies of wing-venation see 

 Wings of the Tenthredinoidea. PP. 570-574. 



