NO. 1438. WINGS OF THE TENTIIREDINOIDEA—MacGILLIVRAY 



597 



spondinsi" parts in Dolerus or KnipJiytua^ but this is nudoubtedly duo 

 to the elongation and narrowing- of the wing. That this position is 

 due to the elongation of the wing is proven by the wing of Lycdota 

 (fig. 55), which is broad and not at all elongated, while the anasto- 

 mosis occupies a position similar to that of the free part of the second 

 anal in Dolerus (fig. 49), and Einphytus (fig. 46). In the Cimbicina' 

 most of the g-enera have lost the emargination found in the Tenthred- 

 ininiv, but in a few genera, as Ahia, it is prominent. Even though 

 the emargination were wanting' in all the genera of this subfamily, the 

 general contour of the anal area in the more generalized genera, as 

 Clnibei' and Trlchiomma., would show their intimate relation to the 

 Tenthredinini© and Lycaotinte. In the Cimbicinffi (figs. 59-60) the first 

 anal cell is much reduced by the coalescence of the veins at its apex. 

 In OlaveUai'ia (fig. (50) this has proceeded so far that 2d A+Sd A has 

 coalesced with 1st A to just before the free part of M^+Cuj. 



2. thp: hind wings. 



The hind wings of most Hymenoptera have been so greatly reduced 

 that the primary homologies can be determined only after careful 

 study. Once the primary homologies have been established the deter- 

 ge. 



Pig. 13.— Typic.^i, hind wrNi; with thk lacking vein.s indicated by dotted lines. 



raination of the different veins in different wrings is a ver}' simple 

 matter. As the superfamil}^ Tenthredinoidea contains all the hymen- 

 opterous insects in which the hind wings are at all generalized, it is 

 apparent that a study of the wing areas of the members of this super- 

 family is of the first importance. Practicallv all the modifications 

 found in this wing are due to the atrophy of the transverse parts of 

 veins or to a secondary shifting of the transverse parts of veins so as 

 to stiffen the wing more effectually. Fig, 13 represents a generalized 

 hind wing in which the wanting veins are indicated by dotted lines. 



