NO. 1438. WINGS OF THE TENTHREDINOIDEA—MacGILLIVRAY. 603 



a supernumerary vein is proven by its persistence throughout all the 

 different genera of this family. Its preservation is undoubtedly due 

 to its position at the extreme base of the wing, and also to the fact that 

 its anal end curves toward the base of the wing, giving it a location 

 where its liability to be obliterated would be reduced to a minimum. 



THE .\NAL AREA. 



The anal veins of the hind wings, like those of the fore wing, have 

 undergone marked changes but along very different lines. Here, as 

 in the fore wings, there has been a combination of the apices of M.,, 

 M^, Cuj, Cug, 1st A, and 2d A. the transverse free part of the tirst 

 four of these, except M.,, being wanting. The first anal vein extends 

 directly from the base of the wing to the transverse part of M3, in 

 man}^ cases being strongly bowed in front, and from M3 there extends 

 an oblique vein to or nearly to the margin of the wing. This vein is 

 wanting in the Cephidw (tigs. 93-96), Xyelida? (ffgs. 31-35), Acordu- 

 lecera (tig. 83), and Blciniocam.pa (tig. 72). 



The second anal vein is found in its most generalized condition in the 

 wings of Strongylogniiiei' (tig. 51), Ttnthredo (tig. 50), Perieliata (tig. 

 69), and Stroviboceros (tig. 50), where it extends from the base of the 

 wing as a slightly bowed vein and unites with the first anal vein dis- 

 tinctly beyond the transverse part of M^. In the genera Doleru^ (tig. 

 49), Selandria, and Macrophya (tig. 57), the coalescence is only for a 

 short distance in front of the transverse part of M.,. The amount of 

 coalescence increases until in the genera Hylotoma (tig. 76) and Lahl- 

 darge (tig, 78) the coalescence is for more than half the length of the 

 anal cell. The second anal vein is entirely wanting in Xerls (tig. 89), 

 Orys^u,s (tig. 97), Lolxx-tras. (tig. 82), Perga^ (tig. 8-1), PterygopJioru^ 

 (fig. 81), Perreyia (fig. 80), and Acordulecera^ (fig. 83). The disap- 

 pearance of the second anal vein is undoubtedly due to the fold in the 

 wing just behind the line where the vein would be situated. This sup- 

 position is strengthened by the wing of Xeris and I)telocerui< (fig. 79), 

 where the transverse apical part of the stump is retained. While in 

 Sire.i' alhtcornls (fig. 'S'6)^ the basal half of the uncoalesced part is 

 retained. In Macroxyela (fig. 33) there is a different type of modifi- 

 cation. The second anal vein is situated just in front of the furrow, is 

 as well developed as the other veins and extends almost to the margin 

 of the wing, where it bends abruptly forward and joins the first anal 

 vein just before the free part of M.,. The transverse part in Mano- 

 .eyela (fig. 34) is nearer the base of the wing and there has been devel- 

 oped in addition a secondary spur from the outer posterior angle to 

 the margin of the wing. The Cimbicinte (figs. 59-60) show a similar 

 condition, except that the transverse part of the second anal is near 

 the middle of the wing with a long spur continuous with the longitu- 

 dinal part of the vein. In Macrocephus^ (fig. 95) the spur is present 



