NO. 1438. WINGS OF THE TENTHREDINOIDEA—MACfULLIVRAY. 



598 



occurrence (fig. 11, n-d)\ second, open at the shoulder without a cross- 

 vein — that is, with the free part of 2d A wanting- (fig. 11, (^\ third, 

 contracted at middle without a cross-vein (fig. 11, h-(/)\ fourth, petio- 

 late (tig. 12, a-c)\ and fifth, with the lanceolate cell represented only 

 by the vein forming its front margin (fig. 81). 



The origin of the cells of the anal area has already been discussed, 

 and only the origin of the difl'erent types of cells will be considered 

 here. The anal cells are found in their simplest condition in the 

 families Xyelida? (figs. 31-36) and Lydid^e (figs. 36-43). In these fami- 

 lies the important points to be noted are, that the vein forming the 

 front margin of this area is straight, while the vein forming its hind 

 margin is straight on its apical half and has a prominent bend or 

 emargination on its basal half, 

 known as the contraction of the 

 lanceolate or second anal cell; that 

 the anal veins have not coalesced 

 at base; and that there is a short, 

 ol)lique, transverse vein near the 

 apex. This same type of cell is 

 found in the genera Dolerus (fig. 

 •1*J), EmphytKK (fig. 46), Pseudoslo- 

 hla (fig. 48), and Erioccvmjya (fig. 47), 

 except that the emargination on the 

 hind margin at base is not so deep 

 while the cells themselves are not so 

 l)road. In Blasticotom.a (fig. 44) 

 these cells are narrow^ed, but the 

 portion of the vein on the basal side 

 of the emargination has been en- 

 larged shoulder-like. Among the 

 Siricida? there has been a gradual 

 but marked change; in Xeris (fig. 

 89) and Paururvs (fig. 11, h) the 

 cells have been greatly elongated, together with a corresponding elon- 

 gation of the emargination, while in Tcredon (fig. 90) and Tremex (fig. 

 91) the emargination is so gradual that it would be overlooked if it were 

 not for its presence in the closely related forms, while there has been 

 developed an additional spur which extends from the apical end of the 

 emargination toward the ))ase and margin of the wing. In Megalodon- 

 te>< (fig. 92) these cells have been much shortened, the emargination is 

 almost entirely wanting, while the bellying out of the third anal vein 

 just in front of the free part of the second anal, which is only slightly 

 indicated in the Lydida', is well marked here. In almost all those gen- 

 era where there is a prominent emargination of the third anal vein at 

 base, there is a corresponding expansion of the wing area behind the 



/ 



ff 



Fig. H.— Types of anal cells, a, Macro- 

 XYELEA ferruginea; h Paururuscyaneus: 



C, CEPHUS PYGM.KUS; rf, KONOWIA WALSHII; 



e, Strongylogaster cingulatus; /, Hoplo- 

 CAMPA ferruginea; g, Labidarge dibapha. 



